Where does “ทบิลีซี” come from?

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

Ancestry of “ทบิลีซี”, step by step

Step	Language	Word	Meaning
1	English	Tbilisi	The government of Georgia
2	Russian	Тбили́си	—
3	Georgian	თბილისი	—
4	Georgian	თბილი	warm
5	Old Georgian	ტფილი	warm
6	Proto-Kartvelian	ṭep-	to warm oneself

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