Where does “सा” come from?

सा (Old Marathi) comes from Sanskrit षष्, from Proto-Indo-Aryan ṣwáṭṣ, from Proto-Indo-Iranian šwáćš, from Proto-Indo-European swéḱs — six.

Ancestry of “सा”, step by step

StepLanguageWordMeaning
1Sanskritषष्six
2Proto-Indo-Aryanṣwáṭṣsix
3Proto-Indo-Iranianšwáćšsix
4Proto-Indo-Europeanswéḱssix

Words derived from “सा”

Every word from Proto-Indo-European swéḱs →Every word from Proto-Indo-Iranian šwáćš →Every word from Proto-Indo-Aryan ṣwáṭṣ →