Picking a baby's name is a tough and important decision.

And of course, one of the most important parts of choosing the name is making sure you know how to pronounce it, as one couple found out when they realized they had been calling their son by the wrong name his entire life...

With unusual baby names becoming increasingly popular...

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People are highly likely to pronounce them wrong.

Many celebrity baby names, for instance, are so unusual that we wouldn't know where to start!

via: Shutterstock

Here are some of the most unusual, see what you think:

Coco

Friends star Courteney Cox's baby sounds delicious!

Apple

Gwyneth Paltrow and Chris Martin also went for a foody option.

Blue Ivy

You can't expect Beyonce to do things by halves, right?

Birdie

Busy Phillips took her inspiration from the animal kingdom instead.

Bronx

Ashlee Simpson and Pete Wentz's kid is so over Brooklyn ...

Monroe

Mariah Carey clearly wishes stardom on her kids!

Apollo

Gwen Stefani thinks her baby is out of this world!

Kulture

Cardi B totally went for it with her baby name!

Sunday

Mike Myers clearly has a favorite day of the week!

Luna

Chrissy Teigen and John Legend also took inspo from outer space!

Reign

Kourtney Kardashian went for a regal theme.

North, Saint, Chicago, and Psalm

We literally can't choose the weirdest of Kimye's baby names.

Stormi

Kylie Jenner's kid did give us one of the most iconic memes of the year, though.

Lazer

Well, you didn't expect Diplo to go for a conventional name, did you?

Bear

Kate Winslet clearly wanted a baby to cuddle with.

Everest

George Lucas went for a pretty epic-sounding name.

Lourdes

Madonna played into her own offbeat name with her daughter's.

Denim

Toni Braxton paid tribute to everyone's favorite pants material.

Usher

Yep, Usher's son is also called Usher. Good lord.

Dream

Rob Kardashian & Blac Chyna's baby is certainly dreamier than their current relationship status.

Maple

Jason Bateman is clearly a big syrup fan.

Puma

Erykah Badu was obviously never going to go for a common name.

Java

Was Josh Holloway tired when he came up with this one?

Axl

Fergie is a huge ice-skating fan.

Bluebell

Geri Halliwell (aka Ginger Spice) took the floral name theme to the next level.

Genesis

Is Alicia Keyes a British prog-rock fan?

Dusty Rose

Dusty? Are you sure, Adam Levine?

Sparrow

Nicole Richie went for the least glamorous of birds.

Kyd

Hey, at least David Duchovny went for something accurate.

Blanket

Michael Jackson's very offbeat choice here.

Satchel

Spike Lee went with a more practical name.

True

Khloe Kardashian and Tristan Thompson's baby name is kind of sadly ironic.

Esmerelda

Ryan Gosling and Eva Mendes plumped for one of the lesser-known Disney princesses.

Ace

Jessica Simpson clearly thought her kid was a winner.

Rocket

Sam Worthington went more "out of this world" with his choice.

Ode Mountain

Jena Malone is clearly a poetry and nature fan.

Rainbow

Holly Madison's choice is very kitschy - and colorful.

Elsie Otter

We hate to admit we find Zooey Deschanel's choice kind of cute.

Pilot Inspektor

Really not sure what Jason Lee was going for here.

Hart

Miranda Kerr feeling all romantic ...

Onyx

While Alanis Morisette is feeling darker.

James

You may not think Blake Lively and Ryan Reynolds' choice is too unusual - until you realize that choice was for their daughter...

Sailor

A pretty cute name for Liv Tyler's offspring.

Briar Rose

Rachel Bilson and Hayden Christensen are obviously fans of Sleeping Beauty.

Titan

Kelly Rowland opted for something altogether more violent.

Willow

Pink opted for another "natural" name ...

Brooklyn

Was David and Victoria Beckham's kid named after the place he was conceived?

Kal-El

Nicholas Cage paid tribute to his love for Superman by giving his kid Clark Kent's Kryptonite name.

Peaches

Bob Geldof actually went off-piste with all his kids' names - from Fifi Trixabelle to Pixie.

Lennon

Oasis singer Liam Gallagher paid tribute to John when naming his son.

Banks

Hilary Duff wanted to get fiscal with her baby name.

Homer

Richard Gere was apparently inspired by a family name - but we know your mind just goes to the Simpsons...

Frances Bean

Kurt Cobain and Courtney Love's child is named after the least glamorous food.

Sunny

Adam Sandler's baby name brings positivity - or at least, he hopes so!

You would assume many parents are prepared for the pronunciation to be wrong.

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But, of course, what you wouldn't expect is for the parents to get it wrong...

Well, one woman recently found out that she has been calling her son the wrong name...

via: Shutterstock

His entire life.

The woman shared the revelation that her cousin and his wife have been pronouncing their son's name wrong all his life.

The woman shared the post to Reddit's Am I The Asshole forum where she wrote, "My family is Irish, but my aunt and uncle moved to England about forty years ago, when they were eighteen so my uncle could go to university. Once in England they settled and had 3 kids, including my cousin "Liam" (twenty-eight)."

"Liam grew up in England, married an English girl, and had a son, who's 4."

"For the sake of this post let's say they named him 'Oisin,' which is an Irish name that is meant to be pronounced like 'oh sheen,' in accordance with the old Gaelic tradition of nothing being pronounced like it's spelled."

"I (23f) am in England right now at university. I also have a son, who is 3. Liam and I are within about an hour of each other and we had always meant to meet up. Liam suggested that yesterday, on Christmas, when he and his wife take Oisin to the park, that my son and I come and meet them," she continued.

"I had met Liam before when we were kids and teens (just a few times), but since Oisin was born we had only texted, so I had never heard Liam pronounce Oisin's name. We went to the park, we met up with them, and I said 'this must be Oisin.' Liam asked why I said it like that."

"I asked what he meant. He said it's pronounced like 'oi sin.' Like hoisin sauce without the h. I tried to move past it, introduced my son, sent the boys off to play. "

"Liam's wife asked about my son's name (also very Irish) and I told her. Liam joked that with all I know about Irish names, it was shocking that I'd mispronounced his son's name so badly. I said something like 'I'm not the one mispronouncing it'."

"They asked what I meant by that and I said it's an Irish name, it's pronounced 'oh sheen' and 'oi sin' is probably just a result of the Irish language tricking people. Liam said it's how his parents pronounce it, and I said 'your parents with English accents?'."

At this point, the meeting went downhill and the Reddit user explained that Liam's wife said they had to go, despite not being there long.

And that's where it gets awkward...

"That night I got a call from my aunt and uncle (Liam's parents) asking why I'd told them that they were saying the name wrong, and that 'oi sin' is the correct pronunciation. I said it's really not. They said they were in Ireland until they were eighteen, so there's no way they could be saying it wrong," she wrote.

"During this conversation, I also got a message from Liam saying I'd really upset his wife because she's now convinced that they've been calling their son the wrong name his entire life and that she loved his name before she met me."

"All 3 of them (aunt, uncle, Liam) want me to fix this by telling Liam and his wife I was mistaken and apologise for questioning their pronunciation of their own son's name. I've said I'm not apologising because I'm right, and they've called me an arsehole, saying that even if I am right (which I'm not), it's not my place to correct them on their own son's name. They also feel that me pronouncing Oisin their way at the end was being passive aggressive."

A very awkward situation.

But, we guess it's too late to change it now... For more baby name blunders, scroll on...