Gene Simmons was born as Chaim Witz on August 25, 1949 at Rambam Hospital in Haifa, Israel to Jewish emigrants from Hungary. His mother, Florence Klein survived internment in Nazi concentration camps. She and her brother, Larry Klein, were the only members of the family to survive the Holocaust. His father, Ferenc "Feri" Yehiel Witz, was a carpenter. Simmons spent his early childhood in Tirat Carmel. He practiced playing his guitar for hours on end. He has said that his family was "dirt poor," scraping by on rationed bread and milk. At age seven, he began to pick wild fruit to sell on roadsides together with a friend. At age eight, he immigrated to the United States with his mother and settled in New York City, while his father remained in Israel. In the United States, Simmons changed his name to Eugene Klein, adopting his mother's maiden name.

Eric Singer was born Eric Doyle Mensinger in Cleveland, Ohio. He grew up in Euclid, Ohio. His father, Johnny Mensinger, was of Jewish German descent.

Peter Criss was born George Peter John Criscuola in Brooklyn, New York, the oldest of five children of Loretta and Joseph Criscuola. His father's family came from Scafati, Salerno, Italy.

Paul Stanley was born Stanley Bert Eisen in Upper Manhattan, New York City. Both his parents are Jewish. His mother's family fled Nazi Germany to Amsterdam in the Netherlands, and then to New York City. His father's parents were from Poland.

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