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.
German and Jewish (Ashkenazic): nickname for someone who performed wonders, from German Wunder ‘miracle’, Middle High German wunderære. The Jewish name is mainly of ornamental origin. The German name can also be from a nickname for a curious or inquisitive person, from Middle High German wunder ‘curiosity’, ‘astonishment’.