Where does “ostjakkisamojedi” come from?

ostjakkisamojedi (Finnish) comes from Finnish samojedi, from Russian самое́д, from Russian само́-, from Russian сам, from Old East Slavic самъ, from Proto-Slavic samъ, from Proto-Balto-Slavic *sāmas, from Proto-Indo-European somHós — together, one.

Ancestry of “ostjakkisamojedi”, step by step

ostjakkisamojedi traces back through two separate lines of ancestry.

via Finnish samojedi

StepLanguageWordMeaning
1FinnishsamojediSamoyed
2Russianсамое́дin the narrow sense a Nenets
3Russianсамо́-self-
4Russianсамself, -self
5Old East Slavicсамъself, oneself, alone
6Proto-Slavicsamъself, oneself
7Proto-Balto-Slavic*sāmas
8Proto-Indo-EuropeansomHóssame, alike
9Proto-Indo-Europeansem-together, one

via Finnish ostjakki

StepLanguageWordMeaning
1FinnishostjakkiKhanty, Ostyak
2Russianостя́кa Khanty person
Every word from Proto-Indo-European sem-Every word from Proto-Indo-European somHósEvery word from Proto-Balto-Slavic *sāmas