Cognomen Wanniarachchi (Wanniarachchi 
) , in all the world, is a common last name. The last name Wanniarachchi is characteristic of Sri Lanka, where it is quite a common surname, Qatar, where it is a rare surname, and United Arab Emirates. In absolute terms, it is the most numerous in Sri Lanka, United Arab Emirates, and Australia. Very seldom, Wanniarachchi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Wanniarachchi | Australia, United Arab Emirates, Indonesia, Saudi Arabia, Sri Lanka |
| vajira r wanniarachchi researcher ORCID ID = 0000-0002-0801-0209 |
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| hashini i wanniarachchi researcher (ORCID 0000-0003-2050-0910) |
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| neranjana wanniarachchi Sri Lankan cricketer, LK (b. 1998) |
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Mr, Ajith, Chapa, Kamal, Kasun, Kevin, Kusum, Kiran, Pavan, Priya, Ranga, Rajiv, Ruwan, Dilan, Dulmi, Gayan, Teran, Nanda, Nuraj, Nuwan, Viraj, Isuru, Ayomi, Udaya, Asela, Amali, Sam, Ama, Don, Leo, Amal, Ayal, Ceng, Vinu, Upul, Manju, Malin, Sanka, Saman, Sunil, Subha, Supem, Supun, Anada, Anura, Aruna, Aruni, Amila, and Udara