Our son is 26. The shortened version of his name, which is the only version we’ve ever used since the day he was born has three letters. The female version has two letters.
My sister in law, every single time, every birthday card, every present label is always spelt the female way, with two letters. It’s really pissed me off over the years, but she’s highly sensitive to criticism so I’ve never corrected her. She’s still just done it again on his birthday. Would I be unreasonable to say something.