Collins is from the Irish surname Mac Coileáin — Coileán ("young dog, warrior") + mac ("son of") — also Englishness from "son of Nicholas" (Nikoláos, "victory of the people"). A top-500 US baby name (girls) since 2015. Stephen Collins — male. Michael Collins (1890-1922) — male Irish revolutionary leader.
Collins does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Collins reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.