Lechia is an ancient name of Poland, stemming from the word Lech (which is also a common first name). The root syllable survives in several European languages and in some languages of Central Asia and the Middle East in names designating Poland, for example:
- Lenkija in Lithuanian
- Lehia in Romanian
- Lengyelország in Hungarian
- Lehastan in Armenian
- Lehistan in Ottoman Turkish, Gagauz, Kumyk and Crimean Turkish
- Ləhistan/Löhüstan (لهستان) in Middle Azerbaijani
- Lahestan/Lehestan (لهستان) in Persian
- Lähistan (لەھىستان) in Uighur
- Läxstan in Tatar, Bashkir and Siberian Tatar
- Liachistan, Liachija, Lech Jer, Liach, Liach Bijligi in Karaim
Several Polish sports organizations have adopted the name Lechia. The best-known example is Lechia Gdańsk. Other examples include Lechia Lwów and Lechia Zielona Góra. In the People's Republic of Poland, the Nivea branch located in Poznań was named the Pollena-Lechia Cosmetics Factory (Fabryka Kosmetyków Pollena-Lechia).
- "Laesir is the Old Norse term for the Ljachar, a people originating at the river Vistula in Poland". [in:] Theodore Murdock Andersson, Kari Ellen Gade Morkinskinna : The Earliest Icelandic Chronicle of the Norwegian Kings (1030-1157). ISBN 978-0-8014-3694-9 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
Pritsak, Omeljan; Hryshevs'kyi, Mykhailo S (1981). The Origin of Rus': Old Scandinavian sources other than the sagas. Harvard Ukrainian Research Institute monograph series. 1 of The Origin of Rus'. Harvard University Press. p. 300. ISBN 9780674644656. Retrieved 20 July 2020.
[...] 'eastern Wends,' meaning obviously the Vjatyci/Radimici, Laesir 'Poles' or 'Western Slavs' (cf. Old Rus'ian ljaxy) [...].