Where does “anghlodau” come from?

anghlodau (Welsh) comes from Welsh anghlod, from Middle Welsh anglot, from Middle Welsh an-, from Proto-Brythonic an-, from Proto-Celtic an-, from Proto-Indo-European n̥-, from Proto-Indo-European ne — not.

Ancestry of “anghlodau”, step by step

Step	Language	Word	Meaning
1	Welsh	anghlod	dispraise, disapproval
2	Middle Welsh	anglot	disgrace, dishonor
3	Middle Welsh	an-	un-, not
4	Proto-Brythonic	an-	un-, not
5	Proto-Celtic	an-	un-, not
6	Proto-Indo-European	n̥-	not, un-
7	Proto-Indo-European	ne	not

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