I know a couple people named Neil and so many people insist on calling them Niall. A lot of tourists especially seem to just refuse to accept that an Irish person can be called "Neil" and no matter how much they're corrected, say "Niall".
I don't understand how some people have
insisted I'm wrong about my own name. My real name is just one syllable, "Lynn", spelled that way, and since that's the beginning to so many commons names like Lindsey, Linda, Lynette, etc, so many people assume it's short for one of those. I will introduce myself as, "Lynnie" and five minutes later they'll be referring to me as Linda or Lynette or something. When I correct them they think I'm just being picky about a nickname. Even the ones that accept my name is just "Lynn" right away usually don't understand my spelling. They say things like, "Shouldn't it have an 'E' on the end?" or "Shouldn't there just be one 'N'?"

I hoped when I started introducing myself as "Lynnie" it would avoid things like that but they still come up or a lot of people end up calling me, "Lily".