I don't think the naming of fire II/Fira is being discussed here.

I never got to see the reasoning for not being able to use FF names before, what was the general gist of it? It sounds kind of stupid - I've seen someone named Final Fantasy, multiple spellings of Sephiroth, Tifa, Cid, Terra, etc. I don't see the issue. I myself chose a name based off of my favourite book series, Wheel of Time. What is the problem choosing a name you like? You aren't profiting from it in any way at all.