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I don’t know where you are located. But I would think this is a girl. I would not ASSUME, but I would think girl and would clarify first.
In America Quinn and Avery are both unisex, however Avery is far more popular as a girl name and Quinn may not be far behind, so paired together could get tricky.
If that’s what you want-great :) I love both of these names. But since you mentioned (boy) in your post title...I’m guessing you want the gender to be somewhat known, I would pair Quinn with a traditional/well established masculine middle name.