Where does “*yakər” come from?

*yakər (Proto-Scythian) comes from Proto-Iranian *yákr̥, from Proto-Indo-Iranian *yákr̥, from Proto-Indo-European yókʷr̥, from Proto-Indo-European -r̥ — Derives nouns from roots, frequently mass nouns.

Ancestry of “*yakər”, step by step

StepLanguageWordMeaning
1Proto-Iranian*yákr̥liver
2Proto-Indo-Iranian*yákr̥liver
3Proto-Indo-Europeanyókʷr̥liver
4Proto-Indo-European-r̥Derives nouns from roots, frequently mass nouns
Every word from Proto-Indo-European -r̥ →Every word from Proto-Indo-European yókʷr̥ →Every word from Proto-Indo-Iranian *yákr̥ →