Kerri is the English-American spelling variant of the Irish Ciara — feminine of Ciar ("dark, black, dusky") — also the name of the southwestern Irish county Kerry. Kerri Russell is Keri (different spelling).
Subject of countless Olympic-beach-volleyball histories.
Kerri 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 Kerri reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.