I've never seen it spelled that way, but I've seen the surname Collier (CAHL-yer or CAH-lee-er) and also a woman I work with has a daughter named Collier. Yes, a girl. :b Not sure on the spelling, though. But she's 20 years old, and they pronounce it CAHL-yer.
I don't really care for it. Maybe as a mn and for a boy, but only if it's a family name, etc.
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Heather~