The name Clare is derived from the Latin word "clarus", meaning "bright" or "clear". It has its origins in the Roman era and was initially used as a masculine name.

During the Middle Ages, the name gained popularity as a feminine name due to its association with St. Clare of Assisi, a 13th-century Italian saint and follower of St. Francis of Assisi. St. Clare was born Chiara Offreduccio in 1194 and founded the Order of Poor Ladies, now known as the Poor Clares.

One of the earliest recorded uses of the name Clare as a feminine name comes from the 12th century, when it was used in England. In the 13th century, the name was also found in France, where it was spelled as "Claire".

Throughout history, several notable women have borne the name Clare. One of the most famous is Clare of Assisi (1194-1253), the Italian saint who founded the Order of Poor Ladies. Another is Clare of Montefalco (1268-1308), an Italian Augustinian nun and mystic.

In the 14th century, Clare Gamelyn (c. 1292-1335) was an English heiress and landowner, known for her involvement in the Peasants' Revolt of 1381. In the 16th century, Clare Conduit Paston (c. 1504-1553) was an English gentlewoman and letter writer, whose correspondence provides valuable insights into the life of the English gentry during the Tudor period.

In the 19th century, Clare Boothe Luce (1903-1987) was an American author, politician, and ambassador, known for her plays and her role as the first woman to serve as a major ambassador for the United States.

The name Clare has maintained its popularity throughout the centuries, particularly in the English-speaking world, and continues to be a popular choice for baby girls.