Erik
Makrusch, Konstantin Detkowo, Russia 26 1886 1912 Is he your ancestor ? Konstantin was naturalized citizen. You might want to request his naturalization intent and petition. He left a sister O KUR.ENOK Detkowo god. Wilno.
If your ancestor had social security numbers than his SS-5Form should have his place of birth and names of his parents.
www.surnamenavigator.org No village named Detkow in Poland. Possible the village is now in Lithuania.
Makrusch, Wassily Lesnowo, Russia 31 1882 1913
Mokrusch, Aleksandr Dedkowo, Russia 28 1884 1912