Where does “Тбили́си” come from?

Тбили́си (Russian) comes from Georgian თბილისი, from Georgian თბილი, from Old Georgian ტფილი, from Proto-Kartvelian ṭep- — to warm oneself.

Ancestry of “Тбили́си”, step by step

Step	Language	Word	Meaning
1	Georgian	თბილისი	—
2	Georgian	თბილი	warm
3	Old Georgian	ტფილი	warm
4	Proto-Kartvelian	ṭep-	to warm oneself

Words derived from “Тбили́си”

Every word from Proto-Kartvelian ṭep- →Every word from Old Georgian ტფილი →Every word from Georgian თბილი →