I like it a lot, especially with the nn
Tolly. My only concern is that people won't know how to prn it. It needs to be paired with something more common, just so the two names balance out. Some ideas:
Ptolemy William - Though this is blah.
Ptolemy EdwardPtolemy JohnPtolemy MarkPtolemy LukePtolemy MatthewPtolemy AidanPtolemy CameronPtolemy LoganPtolemy BrandonPtolemy Eric