Every adult male with the surname of Dieckmann, Diekmann, Dieckman, Diekman, Dyckman, Dykeman, Dickman or similar is invited to participate no matter where in the world you reside. Females are also welcome but it is best to have a male relative with that surname be a female's YDNA-proxy, e.g. her brother; her father; her uncle; her male cousins. This group also invites adult males who can trace their strictly male line ancestors to a Dieckmann forefather.