Memphis is from the Greek rendering of the Ancient Egyptian Mn-nfr ("established and beautiful") — the ancient capital of Lower Egypt. Memphis, Egypt — ancient Egyptian capital founded c. was assassinated April 4, 1968).
Memphis 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 Memphis reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.