Where does “Hilaríus” come from?

Hilaríus (Icelandic) comes from Latin hilaris, from Ancient Greek ἱλαρός, from Ancient Greek ἵλαος, from Proto-Indo-European sēlh₂- — to calm, quiet, be favourable.

Hilaríus (Icelandic): now extinct (as far as is known)

Definitions

now extinct (as far as is known)

Ancestry of “Hilaríus”, step by step

Step	Language	Word	Meaning
1	Latin	hilaris	cheerful, lively, light-hearted, merry
2	Ancient Greek	ἱλαρός	cheerful, merry, joyous, glad, happy
3	Ancient Greek	ἵλαος	propitious, gracious, merciful; kind, mild,...
4	Proto-Indo-European	sēlh₂-	to calm, quiet, be favourable

Every word from Proto-Indo-European sēlh₂- →Every word from Ancient Greek ἵλαος →Every word from Ancient Greek ἱλαρός →