Where does “поручні” come from?

поручні (Ukrainian) comes from Ukrainian рука, from Proto-Slavic rǫka, from Proto-Balto-Slavic ránkāˀ, from Proto-Indo-European wrenk-, from Latvian wer- — to turn, to bend.

Ancestry of “поручні”, step by step

StepLanguageWordMeaning
1Ukrainianрукаhand; arm; hand, handwriting
2Proto-Slavicrǫkahand; arm
3Proto-Balto-Slavicránkāˀhand, arm
4Proto-Indo-Europeanwrenk-to turn, twist, bend
5Latvianwer-to turn, to bend
Every word from Latvian wer- →Every word from Proto-Indo-European wrenk- →Every word from Proto-Balto-Slavic ránkāˀ →