Mabli is the Welsh form of Mabel, from the Latin amabilis — lovable, dear. It has a soft, affectionate ring rooted in old tradition.
It reads warm and gentle, a name that means beloved.
Mabli 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 Mabli reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.