Sukhmani is from the Punjabi sukh (peace, comfort) + mani (jewel, pearl) — pearl of peace. Sukhmani Sahib is the Sikh prayer composed by the fifth Sikh guru Guru Arjan Dev Ji (1563-1606) in c. The 24-section composition (each called an ashtpadi) is recorded in the Guru Granth Sahib (Sikh holy scripture, pages 262-296). The name Sukhmani has become the Sikh feminine name evoking the prayer + spiritual peace. figure in modern Sikh Punjabi diaspora naming.
Sukhmani 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 Sukhmani reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.