Cognomen Pathiraja (Pathiraja 
) , around the world, is a common surname. The family name Pathiraja is characteristic of Sri Lanka, where it is quite a common surname, Kuwait, where it is quite a rare surname, and Qatar. In absolute terms, the name is most common in Sri Lanka, United Arab Emirates, and Saudi Arabia. Very seldom, Pathiraja is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Pathiraja | United Arab Emirates, Indonesia, Kuwait, Saudi Arabia, Sri Lanka |
| ramya priyanwada pathiraja researcher |
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| angela a pathiraja researcher |
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| p d m pathiraja researcher (ORCID 0000-0002-7124-9634) |
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| pathiraja a gunatillake researcher |
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| gathanayana pathiraja researcher (ORCID 0000-0001-9560-9828) |
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| pubudu pathiraja researcher |
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Mr, Nisha, Nimal, Nuwan, Inoka, Umesh, Udaya, Udara, Mahesh, Sanath, Junil, Sarala, Shihan, Sepali, Swarna, Ananda, Angela, Anusha, Aditha, Adrian, Asanka, Sajith, Gihan, Gehan, Gayan, Ms, Sam, Don, Mary, Anil, Amal, Noel, Manoj, Mewan, Saman, Shash, Sunil, Aruna, Amila, Chapa, Kasun, Kusal, Pahan, P M S, Rohan, Ruwan, Asitha, and Ayesha