My associations are based on the only
Ian I knew growing up, who was kinda gawky but kinda athletic, with a knack for making people laugh really hard. Then there's the popularity of the name over the last decade or two. I've met or heard of a LOT of Ians age 7-teens.
It was a favorite name of mine for several years (about 1999-2003?). I still like it a lot and the only turnoff for me is, it feels overused.