Last name Guelbenzu (Guelbenzu 
) , in the world, is a rare cognomen. The cognomen Guelbenzu is habitual in Uruguay, where it is quite a rare surname, Spain, where it is a rare surname, and Argentina, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Spain, Uruguay, and Colombia. Much less frequently, Guelbenzu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Guelbenzu | Argentina, Colombia, United States, Spain, Uruguay |
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juan maría guelbenzu Spanish composer, pianist and organist, ES (b. 1819) |
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| josé maría guelbenzu Spanish writer, ES (b. 1944) |
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| a. nicuesa guelbenzu researcher |
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| ana nicuesa guelbenzu researcher |
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| manuel de vicente-tutor y guelbenzu ES |
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