from the personal name Lukas (see Lucas),
or from the female personal name Liutgard (from Old High German
liut ‘people’ + gard ‘protection’). The latter was a
popular name in medieval times; among others it was the name of the
daughter of emperor Otto I and the wife of Charlemagne.
short form
of the personal name Laurentius (see Lawrence), of Slavic
origin.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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