Cognomen Winai (วินัย 
, Winai 
, วิใน ) , globally, is a rare family name. The cognomen Winai is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, and Malaysia, where it is a very rare surname. Predominantly, Winai is the forename as well as the last name.
Sony, Jiraruekmongkol, Thongyoi, Tingwang, Srilachai, Sriularawat, Passaphan, Pisonyabut, Phichayos, Thanakeeree, Hongpitakpong, Srimekarat, Kanjanapat, Kharuwannapat, Kittidumkerng, Putthisaksawong, Rungrojsoontorn, Weerawatpruchya, Siriworakunchai, Chayangkulpong, Boonsirisoontorn, Phurinanthakul, Dindaeng, Rittikai, Phaewcham, Padonanusit, Mamah, Baolee, Pinjai, Mahamad, Meebudpakdee, Surapat, Sukkaew, Somboon, Boonlue, Ketphan, Prayoonsawatdet, Khamnoi, Putchot, Plienbumrung, Jankaew, Jaranil, Thabthon, Muensuwan, Sungngarm, Chartwieng, Kaewsila, Kaewborrisut, Khiawrod, and Wiphatthanakankul