Where does “am-” come from?

am- (Proto-Celtic) comes from Proto-Celtic an-, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

Ancestry of “am-”, step by step

StepLanguageWordMeaning
1Proto-Celtican-un-, not
2Proto-Indo-Europeann̥-not, un-
3Proto-Indo-Europeannenot

Words derived from “am-”

Every word from Proto-Indo-European ne →Every word from Proto-Indo-European n̥- →Every word from Proto-Celtic an- →