Polish Surname Agreement

Polish surnames are categorized into main types: adjectival, noun-type, and mixed/irregular.

1. Adjectival Surnames (-ski, -cki, -dzki, -y)
These names function exactly like adjectives. They change based on gender and number:

• Masculine Singular: Ends in -i or -y (e.g., Jan Kowalski, Jan Borowy).
• Feminine Singular: Ends in -a (e.g., Anna Kowalska, Anna Borowa).
• Plural (Mixed/Male): Ends in -scy, -ccy, -dzcy (e.g., Państwo Kowalscy). Surnames in -y undergo standard masculine-personal consonant mutations before taking the -i ending (e.g., Bogaty → Bogaci, Łysy → Łysi, Mądry → Mądrzy). This follows the masculine-personal plural pattern.
• Plural (Women only): Ends in -ie or -e (e.g., siostry Kowalskie, siostry Borowe). This follows the non-masculine-personal plural pattern.

2. Mixed/Irregular Surnames (-e)
Surnames ending in -e (e.g., Linde) decline like adjectives for men in singular cases (taking -em in instrumental/locative), but are indeclinable for women. In the plural, they decline like nouns (e.g., Państwo Lindowie).

3. Noun-type Surnames (Nowak, Duda, Matejko)
These names do not change their base form to indicate gender, but their declension depends on their ending:

• Ending in a Consonant (e.g., Nowak): For men, these decline like masculine nouns. For women, they are indeclinable. Indeclinable means the surname remains frozen and does not change its form across any of the seven grammatical cases (e.g., to jest pani Nowak (this is Ms. Nowak), widzę panią Nowak (I see Ms. Nowak), idę z panią Nowak (I am walking with Ms. Nowak)).
• Ending in -a (e.g., Duda): These decline like feminine nouns for both men and women. Crucially, when used for men, any modifying adjectives must remain masculine (e.g., z tym sławnym panem Dudą (with that famous Mr. Duda)).
• Ending in -o (e.g., Matejko, Pazio): For men, native Polish or Slavic surnames decline like feminine nouns if the -o is preceded by a hard consonant or k, g, ch (e.g., Matejko), but like masculine nouns if preceded by a soft consonant (e.g., Pazio). Foreign surnames with unstressed -o after a hard consonant normally decline as masculine nouns, e.g., Picasso → Picassa, Tarantino → Tarantina. Final-stressed French Hugo is indeclinable as a surname; the Polish given name Hugo has a different paradigm. For women, all surnames ending in -o are indeclinable (e.g., widzę panią Matejko (I see Ms. Matejko)).
• Plural: Most noun-type surnames take the -owie ending for a couple or family (Państwo Nowakowie). When referring only to a group of women, surnames ending in a consonant or -o remain indeclinable (siostry Nowak — the Nowak sisters), but those ending in -a DO decline in the plural (e.g., siostry Dudy — the Duda sisters).

4. Traditional Feminine Suffixes
Historically, women's surnames were often formed by adding suffixes to a husband's or father's surname. A wife might add -owa or -ina/-yna (e.g., Nowakowa, Zarębina), while an unmarried daughter might add -ówna or -anka (e.g., Nowakówna, Zarębianka). While less common today, you will still encounter them, and they decline according to their endings.

5. Declension in Cases
Declinable surnames change through the cases; the indeclinable classes above keep their form. Adjectival names follow adjective declension, while noun-type names follow noun declension rules.

For adjectival surnames outside -ski/-cki/-dzki, a woman may use a feminine form such as Zimna or a legally established unchanged form such as Anna Zimny. Do not rename someone by imposing a different registered surname. The usual Polish -ski family pattern is Kowalski/Kowalska; a foreign official name may preserve -ski for a woman. These name conventions are distinct from declining an established Polish form in a sentence.