Cat #1
Actual name: Pippin
Nicknames: Pip. Pipper. Pipkin. Pip-pip. Senor Pip. The Pipmeister. Pippolous Pippleby. Hateful Face.
Cat #2
Actual name: Merry (Alias: Monty)
Nicknames: Merman. Merp. Monkey. Mon. Monarch of the Glen. Mermonman. Montague. Monster. Worried Face.