Ukrainian, Belorussian, and Polish: ethnic name from eastern
Slavic Lach ‘Pole’. This term is used in Czech to denote the
inhabitants of the northeastern part of Moravia, near the Polish
border.
Slovak, Czech (Moravian), and German (of Slavic
origin): from the personal name Lach, a short form of Czech and
Slovak (V)ladislav (see Laszlo).
Germanized spelling of Slovenian Lah, derivative of
Vlah ‘Wallachian’, ‘Vlach’, ‘Romanian’, or more generally
denoting any person of foreign origin.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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