Hala (هالة) is the Arabic word for "halo" — particularly the luminous ring around the moon. The word carries connotations of soft, ambient light.
Hala Gorani (born 1970), the American journalist, is a contemporary bearer.
Hala 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 Hala reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.