This is the 5377th most frequent Russian word.
отчество
Patronymic name.
This sentence uses the word 'отчество' to inquire about someone's middle name, derived from the father's name, which is a common cultural element in Russia.
Какое ваше отчество?
What is your patronymic?
The word 'отчество' here indicates the person's patronymic name, explaining its origin and customary usage in introducing oneself or others.
Его отчество - Александрович.
His patronymic is Alexandrovich.
In this case, 'отчество' refers to the cultural practice of addressing individuals by their patronymic name in formal or respectful contexts.