Where does “kathāsallāpo” come from?

kathāsallāpo (Pali) comes from Pali kathā, from Sanskrit कथा, from Proto-Indo-Iranian *kátʰaH.

Ancestry of “kathāsallāpo”, step by step

kathāsallāpo traces back through two separate lines of ancestry.

via Pali kathā

StepLanguageWordMeaning
1Palikathāspeech, story, talk
2Sanskritकथाstory
3Proto-Indo-Iranian*kátʰaH—

via Pali sallāpa

StepLanguageWordMeaning
1Palisallāpafriendly talk
2Palisaṃ—
Every word from Proto-Indo-Iranian *kátʰaH →Every word from Sanskrit कथा →Every word from Pali kathā →