If so, it's wrong. Those two keys would clash - their tonics are only a half step apart. The relative minor for C#(major) would be A#m. You find that by calling C# "1" and counting up the musical scale to 6.
In the harmonic D Minor, the C is raised to C#.
That and probably as a pun on the D language. I'm sure Walter Bright just LOVES the name. /s