The name Dack first appeared in the U.S. baby name data in 1968:
- 1970: 7 baby boys named Dack
- 1969: 8 baby boys named Dack
- 1968: 12 baby boys named Dack [debut]
- 1967: unlisted
- 1966: unlisted
The source?
Television actor Dack Rambo (born Norman Jay Rambo).
He’d been on TV since the early 1960s, but in the late ’60s had a starring role in the two-season western The Guns of Will Sonnett (1967-1969). He went on to appear on dozens of shows, including the soap operas All My Children, Paper Dolls, Dallas, and Another World.
Dack had a twin brother who was also an actor — Dirk Rambo (born Orman Ray Rambo). In a 1986 interview, Dack mentioned that the names Norman and Orman were “better than Ralph and Dalph” — the names their father had favored.
Source: Hilton, Pat. “Rambo copes with twin brother’s death.” Cincinnati Enquirer 11 Jul. 1986: 54.