Poland is a blend of other Slavic peoples.
maybe you meant to say Poland is a blend of lechitic western slavs
more than 20 lechitic tribes were united by the Polanie tribe to form Poland
-Polanie- founders of the Piast dynasty (Poznan and Gniezno area)
-Goplanie- lake Gaplo in Kujaw area
-Lędzianie - Bug and upper San river area (from them comes word Lach-Pole)
-Wiślanie - around Krakow (Little Poland)
-Ślężanie -Wroclaw area
-Opolanie - lived by the Odra river - name of city Opole comes from them
-Gołęszyce- upper silesia
-Pomorzanie- baltic region (gdansk-szczecin), included kashubian
-Dziadoszani- lower silesia
-Trzebowianie-lower silesia (legnica area)
-Bobrzanie
-Golęszycy- upper silesia
-Mazowszanie