Calantha (Καλάνθη) comes from the Greek kalós (beautiful) and anthos (flower) — meaning "beautiful flower." The orchid genus Calanthe shares the same etymology.
Calantha is rare as a girls' name but rising as part of the broader return of classical Greek floral names.
Calantha is a compound name. Its parts are ánthos — each an attested element with a recorded meaning of its own.
Calantha 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 Calantha reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.