The Dictionary of Polish Place Names (Nazwy Miejscowe Polski) explains the origin of place names in Poland and details how the place name changed over time.
Volume VI of Nazwy Miejscowe Polski lists one place called Łaś, a village currently in the Masovian Voivodeship.
Nazwy Miejscowe Polski indicates that Łaś was in the Rzewnie Gmina, Ostrołęka Voivodeship in the years 1975-1998, and is 8.5 kilometers southeast of Różan. Mentions of the village include Lassy in (1414-25)1456, versus Lassy in 1426, about Lasche in 1427, Lassy in (1442)1456, about Lasz in 1476, Lasche in 1480, Laszy in 1511, Lasch 1512, village of Łasz in (1565), Royal Lasz in 1582, village of Łaś in 1617, Las in 1783, Łaś in 1827, Łas in 1884, Łaś in 1952, and Łaś, -si, Łaśki in 1971.
The name of the village is probably from the name of a settlement Łas(z), in the first plural, and secondarily Łasz//Łas//Łaś – singularization with mixing of consonant series.
Source: Rymut, Kazimierz, ed., Nazwy Miejscowe Polski (Place Names of Poland) – Krakow 2005, Volume VI, page 284.
Click the link for a PDF copy of the Nazwy Miejscowe Polski entry for Łaś. Translated from the Polish, the entry reads:
Łaś, village, Ostrołęka voivodeship., Rzewnie gmina, 8.5 km southwest of Różan: Lassy (1414-25)1456 SHGMz (MK 3, 65); versus Lassy 1426, about Lasche 1427 MkM I no. 393, 532; Lassy (1442)1456 SHGMz (MK 3, 274v-275); about Lasz 1476 SHGMz(Ep. 13, 64); Lasche 1480 SHGMz(Ep. 13, 288); Laszy 1511 SHGMz(PT 1, 128); Lasch 1512 SHGMz(Ep. 7, 48-48v); village of Łasz (1565) Lumaz II 133; Royal Lasz 1582 ŹDz XVI 386; village of Łaś 1617 Lumaz I 87; Las 1783 MpPerMz; Łaś 1827 Tabella I 278; Łas 1884 SG V 594; Łaś 1952 UW 15; Łaś, -si, Łaśki 1971 UN 129, 39. – Probably from the name of a settlement Łas(z), in the first plural. Secondarily Łasz//Łas//Łaś – singularization with mixing of consonant series. Urszula Bijak
Copyright © 2026 by Stephen J. Danko
