Clare

The anglicized spelling of Irish Clár, from Old Irish clár (“plank, board”), from Proto-Celtic *klāros, *klārom (“table”).

Medieval English vernacular form of Clara, from the Latin clara, feminine of clarus (“bright, shining, clear”), a post-classical name made famous by the 13th century Saint Clara of Assisi. In Oxfordshire, from Clarora, a clay slope.