Definitely! The thingy at the beginning that looks like Xp is the good old Chi-Rho, which gives you Chr(ist) and then the rest makes
Christopher quite comfortably. (Rather like the X for
Merry Xmas, except that chi-rho also provides the r.) And the -us doesn't necessarily mean that he used that form of the name - people would often use the Latin forms of their names in writing, on formal occasions, but just be Christo in everyday life.
Vmfidi is making me think of
Humphrey! Drop the H, use V for U like the ancient Romans, and you're still faced with explaining the total absence of an r ... but perhaps it might give you something to go on?