Birth Name: Donald Zackary Greinke
Place of Birth: Orlando, Florida
Date of Birth: October 21, 1983
Ethnicity: German, English, likely Polish
Family Background: Zack Greinke is an American professional baseball pitcher for the Arizona Diamondbacks of Major League Baseball.
Greinke is the son of Donald Ray Greinke and Marsha Ann Wilkin.
His paternal grandparents were most likely Raymond Siegfred Greinke and Eleanor S. Skonieczny.
Source: http://freepages.genealogy.rootsweb.ancestry.com/~battle/celeb/greinke.htm