Khema (खेमा) means "safety, peace, refuge" in Pali. Khema was the chief female disciple of the Buddha alongside Uppalavanna — declared by the Buddha as foremost in wisdom (paññā) among the bhikkhunīs. Originally a beautiful queen of King Bimbisara of Magadha, she was so vain that the Buddha showed her a vision of beauty's decay; she became enlightened on the spot.
Featured in the Therigatha and Pali canon.
Khema 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 Khema reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.