Where does “vassellittus” come from?

vassellittus (Latin) comes from Latin vassus, from Gaulish wassos, from Proto-Celtic wāstos, from Proto-Indo-European h₁weh₂- — to leave, abandon, give out.

Ancestry of “vassellittus”, step by step

Step	Language	Word	Meaning
1	Latin	vassus	vassal of vassals; servant
2	Gaulish	wassos	young man, squire
3	Proto-Celtic	wāstos	empty
4	Proto-Indo-European	h₁weh₂-	to leave, abandon, give out

Every word from Proto-Indo-European h₁weh₂- →Every word from Proto-Celtic wāstos →Every word from Gaulish wassos →