Sometimes a person becomes well known with his patronymic, e.g. sci-fi writer Lyuben Dilov's full name is Lyuben Dilov Ivanov, while the Bulgarian cosmonaut Georgi Ivanov's full name is Georgi Ivanov Kakalov.
Sometimes a person becomes well known with his patronymic, e.g. sci-fi writer Lyuben Dilov's full name is Lyuben Dilov Ivanov. And the Bulgarian cosmonaut, Georgi Ivanov who's full name is Georgi Ivanov Kakalov.