Yes it is a title.
I have watched both of them and read the manga.
Accelerator - Toaru Majutsu no Index Wiki
"is the codename used to refer to the strongest esper currently residing in Academy City."
So therefore it is a title.
Alucard - Hellsing Wiki
"Alucard has acquired Schrödinger's quantum reality manipulation powers after absorbing him during the Millennium incident. This grants him the ability to exist wherever and however he wishes to. He can also exist in multiple places at once using this power, and he can appear in astral realms (being physically present in a person's mind for example). It also makes him completely immortal; any alterations to his person by outside forces can simply be imagined away, including fatal injuries."
If you would love even more proof I can go find in my manga collection in the books where it to, even states over half of this shit.
Also a really good thing about Alucard is his name.