Delyth is from the Welsh Delyth — neat, pretty, fair from Welsh del (pretty/neat). Delyth is one of the Welsh feminine names — central to traditional Welsh cultural heritage. Welsh feminine name reflecting Celtic heritage.
Delyth 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 Delyth reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.