Family name Fontanillas (Fontanillas 
) , around the world, is quite a rare last name. The surname Fontanillas is habitual in the Dominican Republic, where it is quite a rare surname, Spain, where it is a rare surname, and France. Measured by absolute frequency, it is commonest in France, Philippines, and Spain. Very seldom, Fontanillas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fontanillas | Philippines, Spain, France, Dominican Republic, United States |
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antònia fontanillas borràs Spanish trade unionist (1917-2014), ES (b. 1917) |
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| santiago vendrell i fontanillas (b. 1917) |
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| francesc deulofeu i fontanillas Spanish politician, ES (b. 1960) |
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| patricia fontanillas French water polo player, FR (b. 1964) |
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| pierre fontanillas researcher (ORCID 0000-0002-8944-4454), FR |
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| josep fontanillas picamal Spanish politician, ES |
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