Illyrian - Albanian
The relationship between Illyrian and Albanian is much debated. Some connection seems likely, but the nature of the relationship is disputed beyond a consensus that both languages were spoken in the same area.
In 1709 G. W. Leibnitz called Albanian "the language of the ancient Illyrians"
. Another supporter of this theory is G. Meyer; the Albanian language was for him the most recent stage of one of the Illyrian dialects.
Some current Albanian anthroponomy
also seems to have its Illyrian correspondent: eg the Albanian dash "ram" would correspond the Illyrian "Dassius, Dassus"
; also the Albanian bardhë "white" would correspond to "Bardus, Bardullis, Bardyllis"
which are different Latin written names to imitate the Illyrian sound. And some ethnonyms
of Illyrian tribes also seem to have their Albanian equivalents, e.g., the name Dalmatians may correspond to Albanian delmë "sheep"
; also the name of Dardanians
may correspond to Albanian dardhë
. It should be pointed out, however, that these words present a number of etymological problems, namely incongruent sound correspondences 
Illyrian place-name Albanian Observation Ulkinium (Ulcinj
) ujk "wolf" (archaic ulk
) + -inj "plural or collective ending" IE *(w)ulkos "wolf" + inium "collective suffix"