The name is Treuhilde, a German female name. Translated to "Faitfull Hilde".
Hilde is a female first name. It comes from the old High German hiltja (fight). In Germanic personal names, that were consistently made of two elements, it occurs in Hildegard, Hil(d)trud; Brunhild, Krimhild, Gerhild etc.
In the 19th and 20th centuries Hilde became an independent short given name.