The name is an ancient Czech name of old Slavonic origins. It shares its name with a river and a village in the Czech Republic.
Some sources believe it was a Czech vernacular form (or a direct translation) of Liutgarda (guardian) being a derivative of the Slavic, svet (strong) and hence roughly translating to something like “guard.”
Others believe it may be from the Slavic element svyat (world) or svyetlo (light).
The designated name-day in the Czech Republic is May 11.