Where does “tamojki” come from?

tamojki (Polish) comes from Polish tam, from Polish tędy, from Old Polish tędy, from Proto-Slavic tǫda, from Proto-Slavic tъ, from Proto-Balto-Slavic tas, from Proto-Indo-European só — this; that.

Ancestry of “tamojki”, step by step

Step	Language	Word	Meaning
1	Polish	tam	there; genitive plural of tama
2	Polish	tędy	this way
3	Old Polish	tędy	then
4	Proto-Slavic	tǫda	there, thither
5	Proto-Slavic	tъ	this, that
6	Proto-Balto-Slavic	tas	that
7	Proto-Indo-European	só	this; that

Every word from Proto-Indo-European só →Every word from Proto-Balto-Slavic tas →Every word from Proto-Slavic tъ →