Psamathe was a Nereid, the goddess of sandy shores; her name comes from the Greek for sand.
She calls to mind the soft, sunlit beaches where the sea meets the land.
Psamathe 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 Psamathe reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.