Selin is from the Turkish selin (mountain stream, rushing waters, torrent). Selin Hızlı — modern Turkish figure. Selin Geçit — Turkish artist. Selin Sönmez — Turkish journalist. Selin Doğan — modern Turkish-American figure. Princess Selin — modern Turkish heritage naming.
Selin 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 Selin reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.