Salem is from the Hebrew shalom (peace, completeness) — the biblical city that became Jerusalem ("Yeru-shalem"). Salem, Oregon — state capital. Salem Common — historic park in Salem MA. "Salaam" is the Arabic equivalent peace greeting. The biblical city of Salem appears in Genesis 14:18 where Melchizedek, king of Salem, blesses Abraham. Mount Zion in Jerusalem is referred to as Salem in Psalm 76:2.
Salem 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 Salem reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.