Maribel = Marisa
Marisa = Maribel
Reimu = Raymu
Sakuya = Kimberly R. Johnson, or just Kim
Sanae = Sandy or Sandra
Yuka = Florida.
Youmu = Sakura (Must be pronounced as in Sakura Avalon!)
Mima gets to keep her name, but if ABSOLUTELY necessary, then Nina, or Mimi.