Calypso (Καλυψώ) comes from the Greek kalyptō, meaning "to conceal" or "to cover." In Homer's Odyssey, Calypso is the nymph who holds Odysseus captive on her island for seven years.
Calypso is rare as a given name but rising — chosen by parents drawn to Greek mythological depth.
Calypso 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 Calypso reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.