The only free and comprehensive online etymological dictionary of the Spanish language
ignorar (Verb) "to ignore"
15th cent. Borrowed from Latin ignorare "to not know." From Proto-Italic *en-gnōs-e/o- 'id.' From *en-, a negation prefix (see in-), and *gnōs-e/o- "to know." From Proto-Indo-European *ǵneh3-s- 'id.'
Indo-European
Romance
Asturian inorar, Portuguese ignorar, Catalan ignorar, French ignorer, Italian ignorare, Romanian ignora
Indo-Iranian
Sanskrit jānati "he recognizes"
Tocharian
A kñasäṣt "you recognize"