Dewi has parallel origins. In Indonesian and Malay it means "goddess" — derived from the Sanskrit devī. In Welsh it is the masculine form of David, named after Saint Dewi Sant (patron of Wales).
Dewi Sukarno (born 1940), the Japanese-Indonesian wife of President Sukarno, is a notable bearer.
Dewi 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 Dewi reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.