Of relatively recent origin and uncertain etymology. It is first recorded in the 19th century. It may be a shortened form of Belinda, an adoption of Spanish linda ‘pretty’, or a Latinate derivative of any of various other Germanic female names ending in -lind meaning ‘weak, tender, soft’. It was popular in the 20th century, especially in the 1950s.
Italian: from the plural of cugino ‘cousin’ (Latin consobrinus), which in the Middle Ages had the general meaning ‘relative’, ‘kinsman’. The surname would thus have denoted a person related in some way to a prominent figure in the neighborhood. In some cases it may have been a nickname for someone who used the word frequently as a familiar term of address.