Isolde \i-sol-de, is(o)-lde\ as a girl's name. Possibly (Welsh) "fair lady". In legend, Isolde is an Irish princess made famous by Wagner's opera "Tristan and Isolde".

Isolde has 16 variant forms: Iseult, Iseut, Isold, Isolda, Isolt, Isolte, Isota, Isotta, Isotte, Yseult, Yseulte, Yseut, Ysolda, Ysolde, Ysotta and Ysotte.

For more information, see also the related name Esyllt.