-  Danskernes Navne, based on CPR data: 25 805 females with the given name Lis have been registered in Denmark between about 1890 (=the population alive in 1967) and January 2005, with the frequency peak in the 1940s. Accessed on 19 June 2011.
From lis (“fox”).
Lis m pers, f
declension of Lis
The feminine surname is indeclinable.