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I'm quite surprised by that too! But in the UK it's completely associated with Macaulay Culkin - it wasn't used as a first name at all before the Home Alone films, with any spelling. There were a handful of uses from 1991-92, which increased through 1993-5 and seem to have peaked in 1996 when Macauley hit the top 100, and then started to drop.
Macauly, Macaully and Macaulee were also used, and a few girls were given it, too.

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It's nmsaa. Celebrity names and non-family surnames as first names are not my thing.