Where does “Северный Ледовитый океан” come from?

Северный Ледовитый океан (Russian) comes from Russian ледовитый, from Russian лёд, from Old East Slavic ледъ, from Proto-Slavic lȇdъ, from Proto-Balto-Slavic ledús, from Proto-Indo-European ledʰ-u-s, from Proto-Indo-European ledʰ- — ice.

Ancestry of “Северный Ледовитый океан”, step by step

Северный Ледовитый океан traces back through 3 separate lines of ancestry.

via Russian ледовитый

StepLanguageWordMeaning
1Russianледовитыйcovered with ice, having plenty of ice
2Russianлёдice
3Old East Slavicледъice
4Proto-Slaviclȇdъice
5Proto-Balto-Slavicledúswater in frozen form; ice
6Proto-Indo-Europeanledʰ-u-s
7Proto-Indo-Europeanledʰ-ice

via Russian Се́верный

StepLanguageWordMeaning
1RussianСе́верныйnorth, northern
2Russianсе́верnorth
3Proto-Slavicsěverъnorth
4Proto-Balto-Slavicśḗˀweras
5Proto-Indo-Europeanḱeh₁wer-o-

via Russian океа́н

StepLanguageWordMeaning
1Russianокеа́нocean
2Ancient Greekὠκεανόςocean
3Ancient GreekὨκεανόςthe great earth-encircling river; Oceanus, a...

Words derived from “Северный Ледовитый океан

Every word from Proto-Indo-European ledʰ-Every word from Proto-Indo-European ledʰ-u-sEvery word from Proto-Balto-Slavic ledús