For a long time I have suspected that all the Slavs come from the Veneti, and Sorbs know it for sure
I have been wondering about this for quite some time. Just to think; similarity of name for Croatian town Osijek and name Osiek for many Polish places isnt just accidence.
Not only Osjek. For example your capital name Ljubljana sounds similar to Polish towns Lublin, Lubin, Lubań, Luboń, Lubanowo etc.