Forgot this:

Is the origin of SAM-land same as SUOMI, SOOME, ZUM, SAM names that has been used of finns?

Somebody told me that some Finnish (Finland was part of Sweden) soldiers stayed in Samland after Polish-Swedish war (1625-1629).
Sweden kept some harbors after war quite a long time, one was Pillau in Samland. So that's why some Samland familynames were finnish.

In 1625, the Swedes quickly occupied all of Livonia and Courland by the year's end. In May 1626 Gustav Adolf began the surprising invasion of Prussia. Gustav's landing in Ducal Prussia near Pillau with over 8,000 soldiers came as a surprise to the Polish-Lithuanian Commonwealth and despite his relatively small forces, Gustav Adolf acting with the support of the Elector of Brandenburg quickly captured all of the coastal towns, with the exception of the largest prize: the city of Gdańsk (Danzig). The Commonwealth received no support from its vassal, Ducal Prussia. Near the village of Gniew in a battle (22-30 September 1626) Gustav defeated a Polish army led by King Sigismund. Sigismund retreated and called from reinforcements from other parts of the country.

However this victory was not followed up politically and militarily. Despite's all of Koniecpolski's brilliant efforts, a ceasefire in Stary Targ (Truce of Altmark) on 26 October, 1629 was in favour of the Swedes, to whom Poland ceded the larger part of Livonia with the important port of Riga. Swedes also got the right to tax Polish trade moved through the Baltic (3,5% on the value of goods), kept control of many cities in Royal Prussia (including Baltiysk (Pillau, Piława), Memel and Elbląg (Elbing)) and for the time were generally recognized as the dominant power on the southern Baltic Sea coast. Duchy of Prussia was compensated by its losses (occupation of some cities by Swedes) by Commonwealth, with the temporary (until 1634) transfer of Malbork, Sztum and Żuławy Wiślane. Remaining ships of the Commonwealth fleet were transferred to Sweden. The Swedes only failure was their inability to capture the important port of Gdańsk.