Where does “Racōviānus” come from?

Racōviānus (Latin) comes from Latin Racovia, from Polish Raków, from Polish rak, from Old Polish rak, from Proto-Slavic rakъ, from Proto-Balto-Slavic rṓˀkas, from Proto-Indo-European wreh₃kʷos — looking backwards.

Ancestry of “Racōviānus”, step by step

Step	Language	Word	Meaning
1	Latin	Racovia	{{l\|en\|Raków}}
2	Polish	Raków	one of several villages in Poland
3	Polish	rak	cancer; crayfish; crampon
4	Old Polish	rak	—
5	Proto-Slavic	rakъ	crayfish
6	Proto-Balto-Slavic	rṓˀkas	—
7	Proto-Indo-European	wreh₃kʷos	looking backwards

Words derived from “Racōviānus”

Racovian

Every word from Proto-Indo-European wreh₃kʷos →Every word from Proto-Balto-Slavic rṓˀkas →Every word from Proto-Slavic rakъ →