Rahel is from the Hebrew Rāḥēl (רָחֵל — ewe) — Amharic ራሄል + Tigrinya rendition of biblical Rachel. Rahel is one of the Ethiopian + Eritrean Christian feminine names — central to Ethiopian Orthodox Tewahedo + Eritrean Orthodox Tewahedo religious tradition. Biblical Rachel was the matriarch — Jacob's beloved second wife, mother of Joseph and Benjamin (Genesis 29-35) — central to Jewish, Christian, and Islamic religious heritage.
Rahel 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 Rahel reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.