I usually don't like names with a ''kwi'' sound to them, but Quinn and Quinlan are exceptions to the rule, as they sound nothing like tacky ghetto names. Quinn is quite popular nowadays, and I don't really like the sound of Quincy, so this could be a nice middle name to Ewan, if I ever have a son. It doesn't appear to have a religious background, it's quite short and simple, it doesn't sound infantile or pretentious, and it's just pleasant-sounding.
Who the hell names their kid Quinlan? Why would you pick a name beginning with a "Q" anyways? Makes me think of a nerd with massive glasses and braces.
A famous bearer of this name is Quinlan Vos an unorthodox Jedi Knight in the Star Wars: The Clone Wars T.V. series and Clone Wars comics/graphic novels.