Mainly Australian: probably originally a short form of Rachel, but now generally taken as a feminine form of Ray or Raymond, or simply a derivative of ray meaning ‘sunbeam’. In some cases it may be a transferred use of the Scottish surname Rae, originally either a short form of MacRae (from a Gaelic personal name meaning ‘son of grace’) or a nickname from the roebuck. It is often used in combinations such as Rae Ellen and Mary Rae.
German and Dutch: 1. from Dutch and German gans ‘goose’, hence a nickname for a foolish person or a metonymic occupational name for someone who bred or tended geese, or a habitational name for someone who lived at a house distinguished by the sign of a goose. 2. nickname for a healthy or strong person, from Middle Low German gans ‘whole’, ‘complete’, ‘healthy’.