Well, I'm sure I'm the odd one here, but I actually kind of like this name. A Hall is a stately room, in old buildings the biggest and fanciest room reserved for formal gatherings, like a parlor but way more impressive. I don't see it as any less acceptable than names clearly taken from places like Boston or Brooklyn or occupations like Harper. Might be confused with Hal or Paul or Holly.
This is one of those names which should stay a surname. It doesn't sound like a person's name at all. At least some other surnames used as forenames, pretentious as they usually are, can be pulled off.
I'm not quite sure whether I should find this pretentious or just flat out bizarre. It's a room, after all. And a place. It works much better as a surname, that's for sure.
I don't see it as any less acceptable than names clearly taken from places like Boston or Brooklyn or occupations like Harper. Might be confused with Hal or Paul or Holly.