Surname that links actress Ingrid and director Ingmar (7)
I believe the answer is:
bergman
(Other definitions for bergman that I've seen before include "Ingmar --, Swedish director" , "Female star of the 1942 film Casablanca, d.1982" , "Ingmar ---, director; Ingrid ---, actress" , "6 24 113 [SCAN-DIN-AVIAN] filmmaker" , "Film people Ingmar and Ingrid" .)