It's the same in Korean as it is in English.
Korean name will be Karen. Names don't translate into Korean because their roots are different. However, you could create your own Korean nickname and/or use the romanized style of the name.
Arlene Warren's birth name is Rempel, Arlene.
Arlene Alda's birth name is Arlene Weiss.
Arlene Charles's birth name is Arlene Gorek.
Arlene Martel's birth name is Arline Greta Sax.
Arlene Corwin's birth name is Arlene Faith Nover.
Arlene Sidaris's birth name is Arlene Terry Smilowitz.
Arlene Lagos's birth name is Arlene Marie Harrington.
It's a weird middle. Arlene is like a name for it to be first. Emily Arlene for example doesn't sound that right. Arlene is best recommended as first name.
The name Arlene means Strong, oath and/or pledge.
Arlene Muhlach's birth name is Arlyn Muhlach.