This is the 7894th most frequent Russian word.
катарины
"Катарины" is the plural form of the name "Катарина" (Katarina), a feminine given name.
In this sentence, 'катарины' is used as the genitive case of 'Катарина', referring to Saint Catherine and expressing possession or association.
В петербургской церкви есть старая икона святой Катарины.
In the church in Saint Petersburg, there is an old icon of Saint Catherine.
Here, 'катарины' is the nominative plural form, referring to multiple individuals named Katarina who purchased an item.
Катарины купили новое платье для праздника.
The Katarinas bought a new dress for the festival.
In this example, 'катарины' is the genitive singular case of 'Катарина', indicating possession or relation of the travels to Katerina.