I kinda like it but would never use it because 1) I'm not Irish. 2) It reminds too many people of killing. 3) In the US it's the name of a beer (some people point out that the beer's actual name is
George Killian's Irish
Red but that makes no difference to me; everyone calls it
Killian's).
I believe surnames are unisex but only like
Killian on a boy.