FYI, “fiancée” refers to a woman, and “fiancé” refers to a man.

I had an English teacher in middle school who named her son Sean, pronounced like “seen,” and she always complain about how people always pronounced it like “Shawn.”

Personally, I think it’s a tad rude to name your child with an uncommon spelling as it’s just setting then up for a lifetime of minor annoyances. But to use a fairly common variant and insist on a non-standard pronunciation is far worse.