Arkham: City, or Vigilante Name?

Long Story Short: I'm developing a story of a Brazilian vigilante, of a Fictional City. And i've already tried to think in a Name for them both, Azrael for the Vigilante, and Arkham for the city. I liked Azrael, but through these days, i though that despite being a good Vigilante name, for me it just eerrrr... As for the city, Arkham would be a Good name for it, it's very easy to Pronounce it, but i've also knew that Arkham is also a name for People. And i've been with this Question in my head: ''Should i use the Name Arkham on the Vigilante, or in the City that he operates?''

What do you guys think?