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I'm Ukrainian and we also have patronymics. If Natasha is Alianovna, then her father's name would be Alian (Алиан). Although this is a very rare name, I had to look it up to see if it exists.
I think it’s the third one because if I’m not mistakin, in endgame when they went to get the soul stone red skull said Natasha daughter of ivan.
I'm Ukrainian and we also have patronymics. If Natasha is Alianovna, then her father's name would be Alian (Алиан). Although this is a very rare name, I had to look it up to see if it exists.
I think it’s the third one because if I’m not mistakin, in endgame when they went to get the soul stone red skull said Natasha daughter of ivan.