Meaning of name Dagmar

The names of some famous persons by the name Dagmar (or its variants) are:

Dagmar, born on 29 November, a famous actress. Dagmar's background: First major female star of television in the 1950s. She was set to sink into the typical role of a dumb blonde, but was quick to cast aside that sterotype and show her wit and personality on television, which she rapidly became famous for. She was also famous for giving her stage name to the Dagmar bumper, a chrome bullet-point bulge on the bumpers of high-class cars such as the Lincolns, Cadillacs, Chevrolets and Buicks built in the 1950s.