A DNA project has been launched for the Schoff surname, along with any variations such as Schaaf, Shoaf, etc. The project uses testing on the male Y chromosome which is passed directly down the paternal line from father to son making it ideal for investigating surname lineages. The testing can be used to uncover, prove, or disprove connections between various Schoff lines and to also give clues about the deeper origins of the lineages.
Project participation is open to any direct paternal-line male Schoff descendant - i.e., a male whose last name is Schoff (or any variation of the surname) or a male whose biological paternal-line ancestry goes back to a Schoff but whose last name was changed at some point, such as due to adoption. Even if you are not a direct paternal-line male Schoff descendant, you can join the project by sponsoring the testing of a Schoff male from your immediate or extended family, such as a brother, son, father, uncle, male cousin, distant male cousin, etc.
Feel free to visit the Schaaf-Shoaf project website for more details: