Her name seems to be a combination of her parents' names and obviously means "skilled woman". See Finwe#Etymology and Indis#Etymology
Quenya
findis
feminine name. Findis
Elements
Word Gloss Finwë Indis “Great Woman”
Sindarin
Findis
Findis
Second child and eldest daughter of Finwë, the first born from his union with Indis (MR/207, PM/343). Her name was a combination of the names of her parents (PM/343).