Cognomen Galappaththi (Galappaththi 
) , globally, is quite a common last name. The family name Galappaththi is characteristic of Sri Lanka, where it is quite a common surname, United Arab Emirates, where it is a rare surname, and Australia. Much less frequently, Galappaththi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Galappaththi | Australia, Canada, United Arab Emirates, Sri Lanka, Saudi Arabia |
| nihal galappaththi Sri Lankan politician, LK (b. 1954) |
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| chinthaka anuruddh galappaththi chess player (b. 1978) |
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| eranga k galappaththi researcher |
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| upul galappaththi (b. 1979) |
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Upul, Savani, Shakya, Sithum, Sudesh, Sujani, Sonali, Ananda, Achini, Chamin, Sarani, Prasad, Danidu, Dinesh, Dulari, Gayani, Lakmal, Lamini, Lalith, Lahiru, Janaka, Renuka, Mahesh, Malith, Manoji, Manju, Sanoj, Sahan, Sajee, Anton, Amali, Amith, Akila, Ajith, Kasun, Pasan, Gayan, Nisal, Nipun, Nuwan, Himan, Viraj, Irumi, Imesh, Udesh, Manoja, Nirupa, and Nipuni