Rhett is the Anglicized form of the Dutch surname Raedt — from raad (advice, counsel). Rhett Butler — roguish protagonist of Margaret Mitchell's Gone with the Wind (1936); played by Clark Gable in the 1939 film — the highest-grossing film of all time when adjusted for inflation; Gone with the Wind won 10 Academy Awards including Best Picture; the novel won the Pulitzer Prize for Fiction (1937) and has sold 30+ million copies worldwide; "Frankly, my dear, I don't give a damn" — Rhett Butler's iconic closing line — was voted the #1 movie quote of all time by the American Film Institute in 2005. Rhett Bomar — male; American football quarterback.
Rhett 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 Rhett reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.