Elin is the Welsh and Scandinavian form of Helen — from the Greek Helénē (light, torch, bright one). Elin Krantz (1985-2010) — Swedish journalist. Princess Elin — Welsh-Scandinavian heritage naming.
Elin 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 Elin reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.