Where does “thet” come from?

thet (Old Frisian) comes from Proto-Germanic þat, from Proto-Indo-European tód, from Proto-Indo-European to-, from Proto-Indo-European só — this; that.

Ancestry of “thet”, step by step

StepLanguageWordMeaning
1Proto-Germanicþatnominative/accusative singular neuter of *sa
2Proto-Indo-Europeantóddemonstrative pronoun; that; it
3Proto-Indo-Europeanto-it; that; the, that
4Proto-Indo-Europeansóthis; that

Words derived from “thet”

Every word from Proto-Indo-European só →Every word from Proto-Indo-European to- →Every word from Proto-Indo-European tód →