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just a bit of misunderstanding here ) First "за АндреЯ Шаховского". Second "(the nominative is Шаховскои)" - ШаховскоЙ
These 2 little incorrections make me think that a real last name of Андрей is...

1) Майя вышла замуж за Андрею Шаховского (the nominative is Шаховскои)
ШаховскИЙ. Андрей Шаховский.

2) Я Маше звонила, но её не было
I called Masha but she wasn't (at home). It's a common form...