Hiromi is from the Japanese 弘美 / 裕美 (Hiromi — hiro generous/abundant + mi beauty — generous beauty, abundant beauty). Hiromi is one of the Japanese feminine names — central to traditional Japanese heritage. The Japanese hiro (弘 abundant/generous) is one of the Japanese virtue-naming roots.
Hiromi 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 Hiromi reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.