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Гы-гы-гы :lol:

София — столица Болгарии. :)

"С́офья" is not wrong. ("Софь́я" is wrong.) "Соф́ия" is the same name, but the foreign variant.
It's not weird, it's just not common. A diminutive is "С́оня".

You can use in Russia "́Анна-Соф́ия".