It's a very old name, but I named my oldest cat after it (actually I called her "Gertruditis") but it's so strange that it's funny, I wouldn't say it's bad obviously.
Also occasionally used in Spanish-speaking countries as a masculine name, though most bearers would've been born before the mid-20th century and much of its masculine usage was concentrated in Latin America rather than Spain. One example: Gertrudis García Sánchez, soldier and Mexical Revolution participant who was governor of Michoacán from August 1914 to February 1915 (https://es.wikipedia.org/wiki/Gertrudis_G._S%C3%A1nchez)