I’ve always preferred [name]Quinn[/name] on a boy, however recently I’ve been liking it on a girl. I think I prefer it as a nickname, but for what? I’ve thought of [name]Aquinnah[/name] which I kind of like, but I’m looking for other suggestions. Thanks!
Harlequin? Henequin (an agave plant)? I can’t think of any association accept Harlequin romances (not exactly great literature), and the word Harlot. 
i like [name]Aquinnah[/name]. Equinox, Quinidine, Sequin?
[name]Quintana[/name], [name]Quintina[/name], and Quintella are all real names, if rather obscure.
Quina
[name]Quinby[/name]
[name]Quincey[/name] (though it’s a boys name to me, it could be cute on a girl)
Quincylla
Quinella
[name]Quinlan[/name]
[name]Quintana[/name]
Quintella
[name]Quintessa[/name]
Quintilia
[name]Quintina[/name]