[Verginius Rufus]

Finnish and Estonian (which belong to the same language family) have 15 cases. Hungarian (distantly related to those languages) has a lot but I don't know how many. All of them have a word for 100 borrowed from an Indo-European satem language. Evidently their remote ancestors didn't need to count to 100.

The Slavic languages can have as many as 7 or 8 cases. Latin has only 6 but the vocative is usually identical with the nominative. Ancient Greek had 5 but Modern Greek has reduced that to 3.

[Cronos]

Yup, polski has 7 cases:
Nominative (Mianownik)
Genitive (Dopełniacz)
Dative (Celownik)
Accusative (Biernik)
Instrumental (Narzędnik)
Locative (Miejscownik)
Vocative (Wołacz)

Latin has 6
Nominative
Genitive
Dative
Accusative
Ablative
Vocative (Locative is rare and context-specific, e.g., place names like Romae “at Rome.”)

Russian too has 6, having dropped evocative.

Sanskrit has 8 cases
Nominative
Accusative
Instrumental
Dative
Ablative
Genitive
Locative
Vocative

Marathi too has 8