The issue with
Macaulay is it sort of a one hit wonder with one association that leaps to mind. If it had 2 or 3 famous namesakes or none at all, it would be fine. If you had a family member or friend with the name at least there would be some other association than just the actor.
What is it about
Macaulay that you like? Is it the sound? Origin? Do you like similar surnames like MacCallum, Macfarley, MacAllister or McGuthrie too?
Here are a few names with a somewhat similar vibe:
Raleigh Connolly
Carlisle Bellamy RomillyNickolai
CodyMontgomeryAckerley
Adley
GeoffreyBarclayBenjamin "
Benji"