Family name Casellas (Casellas 
) , worldwide, is quite a rare last name. The last name Casellas is habitual in Andorra, where it is quite a common surname, Puerto Rico, where it is quite a rare surname, and Spain. Not in comparison with a country's population, it is commonest in Spain, Argentina, and Guatemala. Also, Casellas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Casellas | Guatemala, Spain, Puerto Rico, France, Argentina |
| jaime casellas Spanish composer, ES (b. 1690) |
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raimon casellas Catalan author (1855-1910), ES (b. 1855) |
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| josep casellas i batet ES (b. 1842) |
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| josé crous casellas ES (b. 1846) |
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| josep aixalà i casellas Spanish translator and writer (1860-1944), ES (b. 1863) |
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| fermí palau i casellas Spanish poet, ES (b. 1894) |
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gilbert f. casellas American lawyer and businessman, US (b. 1952) |
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marcel casellas Spanish educationist and composer, ES (b. 1954) |
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| salvador pujadas casellas Spanish painter (1911-1993), ES (b. 1911) |
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| carme cuffí i casellas Catalan painter and watercolorist (1925-2014), ES (b. 1925) |
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| fernando gonzález casellas composer (1925-1998), AR (b. 1925) |
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francesc xavier jonama casellas ES (b. 1969) |
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| joaquín casellas ES (b. 1925) |
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| salvador e. casellas United States federal judge (1935-2017), US (b. 1935) |
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rolando alarcón casellas Cuban chess player, CU (b. 1986) |
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