Pamela was invented by the English poet Sir Philip Sidney for his pastoral romance Arcadia (1590) — apparently from the Greek pan (all) + meli (honey). Pamela Anderson (born 1967) — Canadian-American actress; Baywatch.
Pamela 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.
In Pythagorean numerology the letters of Pamela reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.