Rahma is from the Arabic رحمة (Raḥmah — mercy, compassion) — from Arabic raḥima (to have mercy) related to raḥim (womb). Rahma is one of the Arabic feminine names — central to traditional Muslim heritage. Arabic feminine name reflecting Islamic theological heritage.
Rahma 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 Rahma reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.