Surname Thilan (Thilan 
, Тхилан 
) , worldwide, is quite a rare cognomen. The family name Thilan is characteristic of Sri Lanka, where it is quite a rare surname, Malaysia, where it is a very rare surname, and India, where it is an extremely rare surname. More frequently, Thilan is the forename as well as the last name.
Dao, Pathirana, Ekanayake, Indrasena, Wijesinha, Wijesekera, Wijeratne, Wijetunga, Madushanka, Samarakoon, Kannangara, Priyangana, Rajapaksha, Rathnayake, Rupasinghe, Jayasinghe, Jayasuriya, Wijesinghe, Wimalasiri, Chathuranga, Dissanayake, Weerasinghe, Madusanka, Bartholomeuz, Maduranga, Liyanage, Dang, Dias, Tran, Singh, Silva, Mannan, Mendis, Kumara, Perera, Peiris, Gamage, Nguyen, Herath, Hewage, Bandara, Ponweera, Devinda, Sanjeewa, Bujahers, Danushka, Darshana, Fernando, and Wickramasinghe