Hoa (花) is the Vietnamese word for "flower" — borrowed from the Chinese character. Used as a given name across Vietnam.
Hoa is among the most common girls' names in Vietnam.
Hoa 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.
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In Pythagorean numerology the letters of Hoa reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.