Jean is the medieval Scottish-English feminine of John — from the Hebrew Yochanan ("God is gracious"). A top-15 US baby name from 1907 to 1933, peaking at #11 in 1921. Jean Harlow (1911-1937) — born Harlean Carpenter — the Blonde Bombshell of the early Hollywood sound era; her platinum blonde hair gave the color its name. Died at 26 of kidney failure. Jean Stafford (1915-1979) — American novelist; Pulitzer for Collected Stories (1970). Jean Stapleton (1923-2013) — Edith Bunker on All in the Family (1971-1979). Jean Rhys (1890-1979) — Dominican-born British novelist; Wide Sargasso Sea (1966) reimagined Jane Eyre from Bertha Mason's perspective.
Subject of David Stenn's Bombshell: The Life and Death of Jean Harlow (1993).
In Pythagorean numerology the letters of Jean reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.