Elizabeth (or nicknames thereof) and Renee

• Benee
• Bethenée
• Bettnee
• Elizaren (I like it, it sounds like alizarin)
• Elizée
• Reliza
• Renabeth
• Renzabeth
• Renel
• Reneliza
• Retty

Charles and Earnest

• Chanest
• Charest
• Charlea
• Charlet
• Earles

Renee and Carine

• Carene
• Carinee
• Reca
• Renca
• Rencarin
• Renine
• Renne