When Diane was trending, Diana was probably viewed as the older, stuffier name. Now, however, Diane is becoming dated, and Diana is younger. (I went to school with a few Dianas, no Dianes.)
***
Please rate my personal name lists:
www.behindthename.com/pnl/69381www.behindthename.com/pnl/69381/109399www.behindthename.com/pnl/69381/91835http://greens-end.myminicity.com/