As far as I know "Lubicz" is sort of famous surname in Poland - I think it belongs to "aristocracy or royal people" clan...
Serbs, of noble origin
Oscar Vladislas de Lubicz Milosz (Oskaras Milašius is the Lithuanian spelling of his ...
His father was a Lithuanian-Polish nobleman, but his ancestors were not native to the region. According to family legend, they had emigrated there from the very heart of ethnic Lithuania, on the Baltic peninsula. The Miloszes were refugees in this area too.
LITUANUS
LITHUANIAN QUARTERLY JOURNAL OF ARTS AND SCIENCES
PSYCHOBIOGRAPHY: OSKARAS MILAŠIUS (OSCAR V. de L. MILOSZ),
LITHUANIAN POET, DIPLOMAT AND MYSTIC
SAULĖ BUZAITĖ
Pacifica Graduate Institutelituanus.org/2000/00_4_05.htm