Speakers of Lechitic languages group.
- "Laesir is the Old Norse term for the Ljachar, a people near the Vistula in Poland". [in:] Theodore Murdock Andersson, Kari Ellen Gade Morkinskinna : The Earliest Icelandic Chronicle of the Norwegian Kings (1030-1157). ISBN 9780801436949 p. 471; "The word here for Poles is "Laesum" - the dative plural from a nominative plural "Laesir". This clearly is derived from the old name for Pole - "Lyakh", since in the course of the Slavonic paradigm -kh- becomes -s-in accordance with the "second palatalization" and the addition of the regular Norse plural ending of -ir- [...] [in:] The Ukrainian review. 1963. p. 70; "eastern Wends, meaning obviously the Vjatyci/Radimici, Laesir "Poles" or "Western Slavs" (ef. Old Rus'ian ljaxy) [in:] Omeljan Pritsak. Old Scandinavian sources other than the sagas. 1981. p. 300