The first time I ever encountered a Florian, we were both in Austria. I'd seen his name written down first before I met him and assumed it was a girl.
Of course, I was the foreigner and he had a perfectly normal male name for his country, but I reckon a lot of Brits, when encountering the name in Britain, would also assume it was a girl's name.
It's silly really, because, in the UK at least, we tend to have a lot of male names which can be made into female names with the addition of a letter or two at the end, but it doesn't seem to work the other way around. People would see 'Flora' and lock it in their minds as female, regardless of any extra letters.
Of course, I'm writing Florian as if it was a typo (which it may or may not have been), but the same would be the case with Floran - more so, in fact, as people might possibly be aware of Florian as a continental European boy's name, whereas they wouldn't have heard of Floran at all.