Well, like everyone said, it is only associated with
Macaulay Culkin. I think it's clunky and doesn't really sound like a name, plus I question the spelling every time. It just doesn't look right and Coll doesn't make sense to me because of the spelling, in
Macaulay it would be Caul, but that makes me think on en caul, like in the amniotic sac. I also don't think it fits in with
Alex and
Sylvie.
If you're really like the au sound maybe consider August/Augustine/Augustus,
Austin,
Claude,
Laurence,
Maurice,
Paul,
Saul,
Vaughn.
Scottish names with similar feel/sound:
Alistair,
Callum,
Collin (Coll would make sense),
Lachlan,
Malcolm,
Murray,
WallaceColl nicknames: Colin/Collin/Collins
Mac nicknames:
Cormac,
Mackenzie,
Macsen