Meri is from the Finnish meri (sea) — also used as Latvian/Estonian diminutive of Maria. Meri in Finnish tradition refers to the sea — central to traditional Finnish coastal heritage + Baltic Sea identity. Notable bearer: Meri Lalkov-Brander — Finnish gymnast; Meri as Latvian-Estonian-Finnish diminutive of Maria appears widely across Baltic naming. Also: Meri Saarvuo — Finnish-American singer.
Meri 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 Meri reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.