Leo Andrew Lambert (my favorite as a whole, but possibly too many "l"s without Andrew)
Nolan Andrew Lambert (the "an"s in NolAN ANdrew don't work, also without the Andrew, there are too many "l" sounds)
Maddox Andrew Lambert (works, nice with two or three names)
Brady Andrew Lambert (like, nice with two or three names)
Rowan Andrew Lambert (the same "an" problem, but Rowan Lambert is nice)
Gabriel Andrew Lambert (fine with all three names, but the double "l" is difficult to say without the Andrew)
Mason Andrew Lambert (the same problem, but fine just Mason Lambert)
Gavin Andrew Lambert (the same problem, but fine just Gavin Lambert)
Some sound nice with all three names, but not with just two names (how he will most likely be referred to normally, right?) and others have the opposite problem. I think Brady is the best name with the middle and last name.
Lark