köken: A compound of پار (pâr, “last”) + سال (sâl, “year”). The first component is from Old Persian [script needed] (paruva), from Proto-Iranian *pr̥Hwo-, ultimately from Proto-Indo-European *per- (cognates include English before), and the second component is from Middle Persian ŠNT (sāl, “year”), from Old Persian 𐎰𐎼𐎭 (θ-r-d /θard-, θarad-/, “year”), from Proto-Iranian *carHdáh, from…
köken: From Old Norse fjǫrð, from Proto-Germanic *ferudi (“last year”), from Proto-Indo-European *peruti (“last year”, literally “on the other side of a year”). The development from rð > l (originally /ɽ/) is characteristic of the traditional dialects of central and northern Sweden, compare e.g. vålnad, hin håle.
köken: Inherited from Old Czech loni, lóni, from Proto-Slavic *olni, from Proto-Indo-European *ol-nei. Cognate with Polish łoni, Slovak vlani, Slovene láni, Serbo-Croatian lȃni/ла̑ни, Russian лони́ (loní), and Latin ōlim (“once”).
köken: Perhaps from năm (“year”) + ngoái (“to turn one's head back”).
Etimoloji
An old compound, with as first part Proto-Indo-European *per- (“over”), and the second part a different term in different Indo-European languages (in Ancient Greek and Sanskrit, the second term was probably *ut- < *wet- (“year”), i.e., *per-ut(i)-). In the Baltic case, it is possible that the second element was Proto-Indo-European *sénos: *per-sénos > per-enos > Proto-Baltic *pernas > Latvian…