Where does “hirsikerros” come from?

hirsikerros (Finnish) comes from Finnish kerros, from Finnish kerrata, from Finnish kerta, from Proto-Finnic kerta, from Proto-Indo-European kert-, from Proto-Turkic *keŕ- — to travel, tour.

Ancestry of “hirsikerros”, step by step

hirsikerros traces back through two separate lines of ancestry.

via Finnish kerros

StepLanguageWordMeaning
1Finnishkerrosfloor, storey; layer; Second-person singular...
2FinnishkerrataTo repeat or reread
3Finnishkertatime, occasion; time; times; also once, when the...
4Proto-Finnickertatime
5Proto-Indo-Europeankert-times; to weave, twist together; time
6Proto-Turkic*keŕ-to travel, tour

via Finnish hirsi

StepLanguageWordMeaning
1Finnishhirsilog, timber; fess
2Proto-Finnichircibeam, log
3Proto-Slavicžьrdьperch, pole, ricker
4Proto-Indo-Europeangʰerdʰ-to enclose, to encircle; enclosure, fence, belt
Every word from Proto-Turkic *keŕ-Every word from Proto-Indo-European kert-Every word from Proto-Finnic kerta