Davidyan or Davidian () is an Armenian surname meaning "son of David", thus making it equivalent to Davidson.
Notable people with the surname include: Levon Davidian (1944–2009), Iranian parliament member, psychiatrist and professor Marie Davidian, American biostatistician David Davidyan (born 1997), Russian-Armenian footballer Nelson Davidyan (1950–2016), Ukrainian-Armenian Greco-Roman wrestler Sarkis Davidian (born 1943), Syrian-born Iranian Armenian Catholic bishop
See also Davidian (disambiguation) Claim of the biblical descent of the Bagrationi dynasty