Surname Roizen (Roizen 
, Ройзен 
) , all over the world, is a rare cognomen. The cognomen Roizen is characteristic of Israel, where it is a rare surname, Uruguay, and Russia, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Russia, the United States, and Israel. Much less frequently, Roizen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Roizen | Germany, Israel, United States, France, Brazil |
| Ройзен | Russia, Ukraine, Belarus |
| elena roizen Romanian folk singer from Dobrudja (1945-2007), RO (b. 1945) |
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| peter roizen American computer businessman of Canadian descent, CA (b. 1946) |
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| michael roizen American physician, US (b. 1946) |
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| heidi roizen American businessman, US (b. 1958) |
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| jeffrey roizen researcher |
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| jennifer l roizen American chemist |
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Mr, Iris, Ivan, Igor, Yana, Malka, Sabel, Simao, Sivan, Steve, Alain, Atr-Bc, Carol, Bambi, Bella, Boris, Brian, Karen, Kelly, Peter, Dario, David, Faul, Diego, Vera, Jose, Ms, Jo, Ana, Amy, Ron, Gia, Lea, Lev, Eve, Zvi, Sara, Saul, Alex, Anat, Aida, Paul, Rosa, Rony, Remy, Dana, Lara, Ezra, and Gigia