

So on the one hand, I think you are going to find almost nobody agrees with your pronunciation. On the other hand, you should wear your mispronunciations with pride because what that tells me is that you were a reader growing up and likely came about this word the first time in text without any other context, maybe even many times before you heard it spoken. Your brain made an educated guess (I’m guess pulling from the pronunciation of “jaguar”?). It got it wrong, but understandably so, and it has cemented in your brain. Fix it if you care to, but no real need. Either way, kudos for being a young reader.
I’m guessing he first encountered the word in text without having heard it and his brain guessed it rhymes with “jaguar”, which is understandable.