Birth Name: Michael Andrew Yastrzemski
Place of Birth: Andover, Massachusetts, U.S.
Date of Birth: August 23, 1990
Ethnicity: Irish, Italian [including Sicilian], one quarter Polish, as well as English and Austrian
Mike Yastrzemski is an American professional baseball player. He is an outfielder for the San Fransisco Giants of Major League Baseball (MLB). Mike is the grandson of Hall of Fame baseball player Carl Yastrzesmki.
Mike is the son of Anne and Mike Yastrzemski, who had also played professional baseball. He is married to Paige (Cahill) Yastrzemski.
Mike’s paternal grandfather is Carl Michael Yastrzemski (the son of Carl/Karol Vincent Yastrzemski and Hedwig Teresa “Hattie” Skonieczny). Mike’s grandfather Carl was born in New York. Mike’s great-grandfather Carol was born in Suffolk, New York, the son of Chester Jastrzebski/Yastrzemski and Josephine Mierzejewska/Mierzenaska, who were Polish. Hedwig was born in New Jersey, the daughter of Michael/Michel Skonieczny and Eva K. Mezynieski, who were Polish.
Mike’s paternal grandmother was Carol Anne Casper (the daughter of Walter Anthony Casper and Margaret Cecila Whalen). Walter was born in Pennsylvania, the son of James L. Carbaro, who was Italian, and of Mary, who was born in Austria. Margaret was born in Pennsylvania, the daughter of John Whalen, who was Irish, and of Mary Ann O’Halleran, who also was of Irish origin.
Mike’s maternal grandfather was Charles H. Wesson, Jr. (the son of Charles H. Wesson and Helen Rita Hogan). Mike’s great-grandfather Charles was born in Massachusetts, the son of John James Wesson and Mary Louise Riley, who had Irish ancestry. Helen was born in Boston, Massachusetts, the daughter of John Michael Hogan and Agnes Rosanna McCauley, who were of Irish origin.
Mike’s maternal grandmother was Mary Therese Piazza (the daughter of Placido Raymond Piazza and Anne M. Lally). Placido was born in Massachusetts, the son of Orazio Piazza and Marianna Murgia, who were born in Messina, Sicily, Italy. Anne was born in Massachusetts, the daughter of Anthony Lally and Marianna, who were born in Napoli, Campania, Italy.
Genealogy of Mike Yastrzemski (focusing on his father’s side) – https://www.geni.com
he appears to be more than 1/4 Italian from this.