 They primarily departed from Hamburg, Germany and all arrived at New York City.There was also a group of people with the last name of Dassow who came to Brazil during the period of the German colonization of Southern Brazil and of the state of Rio Grande do Sul from 1830 to 1870.According to the US Census Bureau, Dassow is the 52,272nd most popular family name (surname) in the United States with a frequency of 0.000% and a percentile is 86.286.