Cognomen Irwan (Irwan 
, イルワン) , around the globe, is a common last name. The family name Irwan is habitual in South-eastern Asia, particularly Brunei, where it is quite a common surname, Indonesia, and Malaysia. Not in comparison with a country's population, it is the most numerous in South-eastern Asia, particularly Indonesia, Malaysia, and Singapore. More prevalently, Irwan is the forename as well as the last name.
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| Irwan | Singapore, United States, Indonesia, Malaysia, Saudi Arabia |
| teuku irwan Indonesian politician, ID (b. 1957) |
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| m. feri irwan Indonesian political candidate, ID |
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| andi masyitha irwan researcher |
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| ishak darryl irwan researcher |
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| firas irwan Singaporean footballer, SG |
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To, Chandra, Permana, Pratama, Gunawan, Nugraha, Effendi, Hidayat, Firdaus, Ibrahim, Setiadi, Wahyudi, Setiawan, Prasetyo, Darmawan, Hermawan, Iskandar, Yulianto, Syahputra, Kurniawan, Irwansyah, Widjaja, Sutanto, Sumarno, Susanto, Sah, Wan, Shah, Syah, Jaya, Hadi, Iwan, Ahmad, Putra, Lubis, Fauzi, Idris, Ridwan, Efendi, Ismail, Irawan, Wijaya, Maulana, Santoso, Sanjaya, Saputra, Ardiansyah, and Firmansyah