Léa is the French form of Leah — from the Hebrew Lēʾāh, traditionally translated as "weary" (referring to Leah's role in Genesis as the unwanted first wife of Jacob) but with possible Akkadian roots meaning "lioness" or "wild cow." Modern Hebrew scholarship favours the lioness reading.
Léa has been the most popular girl's name in France for over a decade, in the top 5 since 2003. The actress Léa Seydoux is a famous bearer. The original French spelling Léa with the acute accent is the formal version; the English Leah is more common in Anglophone countries.
Léa reduces to six — the number of warm grace.