Where does “Tbilisi” come from?

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

Ancestry of “Tbilisi”, step by step

StepLanguageWordMeaning
1Georgianთბილისი—
2Georgianთბილიwarm
3Old Georgianტფილიwarm
4Proto-Kartvelianṭep-to warm oneself
Every word from Proto-Kartvelian ṭep- →Every word from Old Georgian ტფილი →Every word from Georgian თბილი →