Family name Arachchi (Arachchi 
) , all over the world, is a common cognomen. The last name Arachchi is habitual in Sri Lanka, where it is quite a common surname, Maldives, where it is quite a rare surname, and Qatar. Not in comparison with a country's population, it most frequently occurs in Sri Lanka, United Arab Emirates, and Bangladesh. Very seldom, Arachchi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Arachchi | Bangladesh, United Arab Emirates, Saudi Arabia, Sri Lanka, Qatar |
| samadhi dandeniya arachchi researcher (ORCID 0000-0003-4814-6255) |
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| piyumali sandareka arachchi researcher ORCID ID = 0000-0002-4622-3117 |
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| wasana ediri arachchi researcher |
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| don kumudu mallawa arachchi Ph.D. Texas Tech University 2009 |
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| lakshman nipuna arachchi Sri Lankan politician, LK |
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| ilesha sandunika ileperuma arachchi Sri Lankan entomologist, LK |
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| migapulle arachchi Lord in the Jaffna Kingdom |
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| niranjan arachchi researcher (ORCID 0000-0003-3337-5581) |
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| nuwan hegoda arachchi researcher (ORCID 0000-0001-8245-6359) |
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| wasantha kodikara arachchi |
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| bimshani jasin arachchi |
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Mr, Sunil, Supun, Anush, Anura, Aruna, Amila, Ashan, Asiri, Asela, Akila, Ajith, Chami, Bscsp, Kamal, Kasun, Kumar, Kusal, Shani, Sajee, Sahan, Saman, Ms, Don, Shan, Soma, Anil, Anoj, Chaz, Ravi, Padma, Devi, Dimu, Nilu, Eroy, Upul, Manoj, Manel, Manju, Mevan, Dino, and Pawan