This is how my name is spelled, and I can't stand it. People always, always, ALWAYS spell it wrong. There are people who have known me for years and still spell it wrong. I have nothing against the name in general, I just hate the way it's spelled.
I have a character whose second middle name is Lyndsey, and he's a boy. I definitely prefer this spelling on a boy. I can't imagine it any other way. I do like it, as it's a nice name.
I personally do not like this spelling of the original Lindsey, though it is not a spelling you see as often. No thanks to a girl who was kind of a slut who ruined this spelling for me, otherwise it is very different.