Avigail is from the Hebrew אֲבִיגַיִל (Avigayil — my father is joy, source of joy) — from Hebrew avi (my father) + gayil (joy). Avigail is one of the Hebrew feminine names — central to traditional Jewish + Christian heritage. Hebrew feminine name reflecting biblical heritage.
Avigail 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 Avigail reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.