Cognomen Grunstein (Grunstein 
, גרונשטיין ) , throughout the world, is a rare last name. The surname Grunstein is characteristic of Israel, where it is a rare surname, Romania, and Finland. In absolute terms, the name is most common in the United States, Romania, and Mexico.
| VARIANT | COUNTRY |
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| Grunstein | Romania, Mexico, United States, France, Israel |
| גרונשטיין | Israel |
| rachel cheigam-grunstein FR (b. 1917) |
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| arlette grunstein French lawyer and political activist (1935-1991) (b. 1935) |
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| pierre grunstein French film producer, FR (b. 1935) |
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| michael grunstein biologist from United States of America, US (b. 1946) |
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| chaya grunstein badminton player, IL (b. 1952) |
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| leonard grunstein American lawyer, US (b. 1952) |
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| ron grunstein researcher (ORCID 0000-0001-6682-5812) |
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Mr, Lana, Leah, Jane, Jose, John, Juan, Nily, Neil, Elva, Gina, Eric, Erno, Ines, Yoav, Maria, Maira, Meyer, Micki, Sarah, Shira, Erin, Gary, Rick, Roee, Ms, Al, Max, Avi, Bob, Guy, Leo, Jaz, Joe, Eli, Ida, Mary, Sara, Alex, Alan, Alma, Ally, Adam, Kira, Paul, Rach, Aniko, and Agnes