I could see a pope who had been involved in healing the breach between the Roman and Greek churches taking the name Constantine II. I could see a pope elected from outside the conclave taking the name Fabian II. Mark II as well as Matthew I and Luke I are certainly possible for a pope who wished to honor one of other gospel writers than John. Miltiades II is a possible, but not very likely name for an African Pope. Francis I is also possible. I would be quite surprised if any other name that has been used either once or not at all was chosen, and even these are unlikely.
Miltiades II would also be a good name for someone seeking East-West reunification, actually.
In theory, a new name is always possible through combining names in the manner of John Paul. There aren't that many names suitable for combining, though.
Miltiades Constantine I. Has a ring to it.
I have a sneaking suspicion he may choose an unprecedented name, and one generally regarded as sacred - Pope Peter the Roman. There are a few reasons I believe this to be the case, but we'll have to wait until the conclave to find out for sure.
What kind of moronic excuse for a papabile would deliberately play into that [Inks]ing 'prophecy'?
They could at least be a little vaguer about it by going by Romanus II (I was surprised to find there has been only one pope of that name when I checked it for this post.)
