The name Don is a boy's name of Scottish origin meaning "proud chief". Don and is often added to lists like Mad Men Names and discussed in our forums with posts like "Quick Question Thread?!".
From the experts:
Short form of Donald -- or more stylishly, Donahue or Donovan -- that's acquired a new sixties-era suaveness thanks to Mad Man Don Draper. The name also carries a Sopranos or Godfather-style double entendre.