Answer
The full middle name of the Russian composer Alexander Borodin is Porfiryevich. This middle name is derived from the Russian Orthodox name Porfiry, which means “purple” or “royal purple.” In the Russian naming tradition, the patronymic (middle) name is formed by adding the suffix "-ovich" or "-evich" to the father's first name. In Borodin's case, his father's name was Mikhail, so his patronymic became Porfiryevich.