Rifka is the Yiddish form of Rebecca — from the Hebrew Rivka, meaning "captivating" or "to bind." Rebecca was the wife of Isaac and mother of Jacob and Esau.
Rifka is widely used in Hasidic communities.
Rifka 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 Rifka reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.