Where does “firth” come from?

firth (Middle English) comes from Scots firth, from Middle English fyrth, from Old Norse fjǫrðr, from Proto-Norse ᚠᛖᚱᚦᚢᛉ, from Proto-Germanic ferþuz, from Proto-Indo-European pértus, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

firth (Middle English): Alternative form of frith; forest, game preserve

Definitions

  1. Alternative form of frith; forest, game preserve

Ancestry of “firth”, step by step

firth traces back through two separate lines of ancestry.

via Scots firth

StepLanguageWordMeaning
1Scotsfirth—
2Middle Englishfyrth—
3Old Norsefjǫrðrfirth, fjord
4Proto-Norseᚠᛖᚱᚦᚢᛉ—
5Proto-Germanicferþuzinlet, fjord
6Proto-Indo-Europeanpértuscrossing
7Proto-Indo-Europeanper-before, in front; first; to go through
8Proto-Indo-Europeanpr̥tóspassed , crossed

via Scots furth

StepLanguageWordMeaning
1Scotsfurthoutside, beyond
2Germanfurtford shallow river crossing

Words derived from “firth”

Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European pértus →
firth — Etymology, Origin & Word History | Etymology Explorer