Arunachalam () or Arunachala () is a Tamil male given name. Due to the Tamil tradition of using patronymic surnames it may also be a surname for males and females.

Notable people Given name Arunachalam or Arunasalam A. Arunachalam, Indian politician Arunachalam Shekhar Dileep Kumar (born 1967), birth name of A. R. Rahman, Indian composer M. Arunachalam (born 1949), Hong Kong based businessman M. Arunachalam (1944–2004), Indian politician P. Arunachalam (1853–1924), Ceylonese civil servant and statesman Panchu Arunachalam (1941–2016), Indian writer, director, producer and lyricist Pon Arunachalam (born 1946), Indian writer R. Arunachalam, Indian politician Subbiah Arunachalam (born 1941), Indian information consultant Subbu Panchu Arunachalam (born 1969), Indian actor and film producer V. Arunachalam (1933–2004), Indian politician, activist, and writer V. S. Arunachalam, Indian politician V. S. R. Arunachalam, Indian scientist

Surname Arunachala Arunachala Kavi (1711–1779), Indian poet and a composer Arunachala Sreenivasan (1909–1996), Indian nutritional scientist Arunachala Thevar, Indian politician Lalpet Arunachala Govindaraghava Aiyar (1867–1935), Indian lawyer, theosophist, independence activist and politician

Arunachalam or Arunasalam Arunchalam Aravind Kumar (born 1954), Sri Lankan trade unionist and politician Arunasalam Kumarathurai (1939–2019), Sri Lankan founder of Kumarapuram Arunachalam Mahadeva (1885–1969), Ceylonese lawyer and politician Arunasalam Murugadoss (born 1974), Indian film director, producer, and screenwriter Arunachalam Muruganantham (born 1962), Indian social entrepreneur Arunasalam Namathevan (born 1996), Malaysian footballer Arunachalam Ponnambalam (1814–1887), Ceylonese government functionary, businessmen and philanthropist Arunachalam Sabapathy (1853–1924), Ceylonese newspaper editor and politician Arunasalam Thangathurai (1936–1997), Sri Lankan lawyer and politician Jaya Arunachalam (1935–2019), Indian social worker

See also