Around the globe, Thaisen (Thaisen 
) is a very rare gender-neutral first name. The forename Thaisen is characteristic of Southern Asia, particularly India, where it is an extremely rare gender-neutral name. More frequently, Thaisen is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Thaisen | Thailand, Australia, India, United States, Denmark |
Mr, Lasse, Lotte, Jonas, Julie, Frank, Winai, Wendy, Martin, Marcos, Marcia, Morten, Mikkel, Saifon, Satiya, Simone, Anders, Amanda, Connie, Birthe, Karina, Ramita, Laura, Glenn, Debra, Robin, Ms, Kim, Ole, Matt, Sven, Rene, Laru, Jane, Jens, Nick, Rasmus, Erik, Marie, Maxie, Sarah, Stine, Claus, Britt, Brian, Kevin, Perla, Peter, Maria, and Deedee