Where does “tád” come from?

tád (Proto-Indo-Aryan) comes from Proto-Indo-Iranian tád, from Proto-Indo-European tód, from Proto-Indo-European to-, from Proto-Indo-European só — this; that.

Ancestry of “tád”, step by step

StepLanguageWordMeaning
1Proto-Indo-Iraniantád—
2Proto-Indo-Europeantóddemonstrative pronoun; that; it
3Proto-Indo-Europeanto-it; that; the, that
4Proto-Indo-Europeansóthis; that
Every word from Proto-Indo-European só →Every word from Proto-Indo-European to- →Every word from Proto-Indo-European tód →