Birth Name: Kathleen Genevieve Ledecky
Place of Birth: Washington, D.C., U.S.
Date of Birth: March 17, 1997
*Czech, Ashkenazi Jewish (father)
Katie Ledecky is an American competition swimmer, Olympic gold medalist, and nine-time world champion. She is the daughter of Mary Gen (Hagan) and David Ledecky. Her father is of half Czech and half Ashkenazi Jewish descent. Her mother is of Irish ancestry. Katie was raised Catholic.
Katie’s mother swam at the University of New Mexico, while Katie’s maternal grandfather was a decorated combat surgeon in World War II.
Katie’s paternal grandfather was Jaromir Ledecky (the son of Jaroslav Ledecky and Jarmila Horcicková). Jaromir was born in Prague, Czechoslovakia.
Katie’s paternal grandmother is Berta Ruth Greenwald (the daughter of Milton Henry Greenwald and Eleanor Tecla Stoll). Berta was born in New York City, New York. Milton was born in New York, the son of Simon Greenwald and Bertha Deutsch, who were Hungarian Jews. Eleanor was born in New York, the daughter of Karl “Charles” A. Stoll, who was Swiss (and possibly not of Jewish background), and of Babette “Bertha” Wyler, who was a Swiss Jew.
Katie’s maternal grandfather was Edward Jordan Hagan (the son of Edward Jordan Hagan and Joan Garvey). Katie’s great-grandparents Edward and Joan were from Ontario, Canada, and were of Irish descent. Katie’s great-grandfather Edward was the son of James Hagan and Anne Jordan. Joan was the daughter of Patrick J. Garvey and Mary Heffernan.
Katie’s maternal grandmother is Kathleen Frances O’Connor (the daughter of Charles O’Connor and Mary Ellen Buckley). Kathleen is of Irish origin. Charles was the son of Daniel O’Connor and Mary MacDonald. Katie’s great-grandmother Mary Ellen was the daughter of John M. Buckley and Mary Maloney.
Sources: Genealogy of Katie Ledecky – https://www.geni.com
Obituary of Katie’s maternal grandfather, Edward Jordan Hagan – http://www.willistonherald.com