Mehwish (مہوش) is an Urdu name meaning “moon-like”. Persian in root — mah, moon, with a suffix of likeness. One of the most recognisably Pakistani names of the modern era.
Mehwish 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 Mehwish reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.