Achall is from the Old Irish achlaim (lament). In Irish mythology, Achall was the daughter of Cairbre Nia Fer, sister of Erc — she died of grief at her brother's death by Cú Chulainn. The Hill of Achall, modern Hill of Skreen near the Hill of Tara, is named for her burial mound.
Featured in the Ulster Cycle.
Achall 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 Achall reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.