Isolde f. Of uncertain origin, either Celtic or Germanic. If Germanic, then it is likely Old High German īs 'ice' + Old High German hiltja 'battle'.
The name of the main female character in the legends and lays of Tristan and Isolde.
The Middle English vernacular form Isoude appears in the matronymic byname of Johannes Isoude, 1318, PSS-CXIV 4b.