Maelys (Maëlys) is the French Breton name from mael meaning "prince" or "chief" — feminine "princess." A modern Breton-French feminine name.
Maëlys is widely used in France.
Maelys 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 Maelys reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.