Subhalakshmi is from the Sanskrit शुभलक्ष्मी (Śubhalakṣmī — śubha auspicious + Lakṣmī goddess of fortune — auspicious Lakshmi). Subhalakshmi is one of the Sanskrit feminine names — central to traditional Hindu Vaishnava heritage. The name connects to M. S.
Subhalakshmi 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 Subhalakshmi reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.