Iseabail (pronounced "ish-ah-bel") is the Scottish Gaelic form of Isabel — from Hebrew Elisheba ("God is my oath"). Iseabail Ní Mheic Cailéin (15th c.) was the Scottish Gaelic poet, one of the few women whose poetry survives in the medieval Scottish bardic tradition.
Used widely in the Scottish Highlands.
Iseabail 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 Iseabail reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.