Where does “Найджел” come from?

Найджел (Russian) comes from English nigel, from Latin Nigellus, from Latin -lus, from Proto-Italic -elos, from Proto-Indo-European -e-lós, from Proto-Indo-European -lós — Forms agent nouns from verbal roots.

Ancestry of “Найджел”, step by step

Step	Language	Word	Meaning
1	English	nigel	of mostly British usage
2	Latin	Nigellus	somewhat black
3	Latin	-lus	Alternative form of -ulus; diminutive suffix
4	Proto-Italic	-elos	Forms desubstantival and deadjectival diminutive nouns
5	Proto-Indo-European	-e-lós	—
6	Proto-Indo-European	-lós	Forms agent nouns from verbal roots

Every word from Proto-Indo-European -lós →