McCoy is from the Scottish/Irish Mac Aodha — son of Aodh (the fire god). "The real McCoy" — iconic English phrase meaning the authentic, genuine article; the origin is disputed but most commonly attributed to Kid McCoy (Norman Selby), an American boxer from 1890s-1900s, whose name became synonymous with authenticity. Dr. Leonard "Bones" McCoy — chief medical officer of the USS Enterprise in Star Trek (1966-present); originally portrayed by DeForest Kelley (TOS, 1966-1969 + 6 feature films); Karl Urban in the 2009 reboot films; Star Trek franchise has grossed over $11.5 billion across films and merchandise. Elijah McCoy (1844-1929) — male; Black Canadian-American inventor; held 57 US patents; his 1872 invention of an automatic lubricator for steam engines revolutionized industrial machinery; the phrase "the real McCoy" is alternatively credited to his name — engineers reportedly asked for "the real McCoy" lubricator instead of inferior imitations.
McCoy 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 McCoy reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.