Власні назви: імена, по батькові й топоніми

Given names

Belarusian first names decline like ordinary nouns of their gender: Янка - Янкі - Янку, Алеся - Алесі - Алесю. Note that Янка, though it ends in -а, is a man's name and takes masculine agreement with feminine endings - Янка прыйшоў, not прыйшла. This is the same pattern as дзядуля and стараста.

Patronymics

Formed as in Russian but with Belarusian phonetics: -авіч / -евіч for men, -аўна / -еўна for women. Іван gives Іванавіч and Іванаўна; Пятро gives Пятровіч and Пятроўна.

Full formal address is name plus patronymic, as in Russian. The revived alternative is спадар or спадарыня plus the surname, which many people now prefer.

Surnames

The rule that catches people: a surname in -віч does not decline for a woman. Я бачыў Савіча but Я бачыў Ганну Савіч.

Place names

Belarusian place names decline: у Мінску, з Гародні, пад Полацкам, на Палессі. Note у Мінску - the locative in -у, not -е.

Several cities carry two forms, because the standard Belarusian name and the Russian-derived international name differ:

This is not a spelling curiosity. Which form somebody uses is often a statement, and it is worth knowing that before you pick one.