There are 4 mathematicians whose last name begin with SIY.
| Siyahjani, Farzad | West Virginia University | 2017 |
| Siyanko, Sergei | University College London | 2016 |
| Siyoum, Firew | Technische Universiteit Eindhoven | 2014 |
| Siyyam, Hani | Colorado State University | 1994 |