Aoibhe is from the Irish Aoibhe — variant of Aoife — from the Old Irish aoibhinn (radiance, beauty, pleasant). Aoibhe is one of the Irish-language feminine names — central to modern Gaeltacht communities. Aoife (the source variant) is the warrior princess of Scottish Albanian mythology + the second wife of Cú Chulainn in the Ulster Cycle — central to medieval Irish epic literature.
Aoibhe 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 Aoibhe reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.