Adjectives - Novotn
Nouns - Roubínek
Nouns in -a or -o - Svoboda
are always adjectival.
If the man's surname is an adjective, the feminine of the adjective is used: Novotná.
If the man's name is a noun, the ending -ová is added: Roubínková.
When two persons of the same name are mentioned, plural forms are used.