The name later was used attributively of gentlemen of exceptional courage and integrity, in this sense from Pierre du Terrail, seigneur de Bayard (1473-1524), French knight celebrated as Chevalier sans peur et sans reproche. The surname is perhaps in reference to hair color.
Originally in French a legal term, "condition of a person in expectation or hope of receiving property;" it turned around in English law to mean "condition of property temporarily without an owner" (1650s). Hence "state of suspended action or existence." The French verb baer is also the source of English bay (n.2) "recessed space," as in bay window.
large bay in eastern U.S., from a central Atlantic coast Algonquian language, perhaps literally "great shellfish bay" [Bright]. Early spellings include Chesepiooc and Chesupioc.
island in the Greater Antilles group of the West Indies, Spanish, literally "rich harbor;" see port (n.1) + rich (adj.). The name was given in 1493 by Christopher Columbus to the large bay on the north side of the island; he called the island itself San Juan. Over time the name of the bay became the name of the island and the name of the island was taken by the town that grew up at the bay. Often spelled Porto Rico in 19c.; the current spelling was made official in 1932.