Gaynor \ga(y)-nor\ as a girl's name (also used as boy's name Gaynor), is of Welsh origin, and the meaning of Gaynor is "white and smooth, soft". Medieval form of the name of Arthur's queen, Guinevere.
Gaynor has 3 variant forms: Gaenor, Gayna and Gayner.
For more information, see also the related name Jennifer.