Definition from Wiktionary, the free dictionary
Proper noun 
- A female given name, a fanciful spelling of Gail, shortened form of Abigail.
- (now rare) A male given name
- A surname.
- A South African argot (jargon) used in South African gay and same-sex communities, primarily by Indo-European based speakers.
See also 
- Gayle: the language of kinks and queens: A history and dictionary of gay language in South Africa, by Ken Cage, Moyra Evans, 2003, page 23, 51.