The Sivaks are coming to the party tonight.

My friend's last name is Sivak.

The Sivakumars are a talented family of actors.

My friend's last name is Sivakumar.

Sivatheres were large herbivorous mammals that lived during the Miocene epoch.

The sivathere is a large herbivorous mammal that lived during the Miocene epoch.

He practices a Sivaistic form of meditation.

The sivatherines are majestic creatures.

The sivatherine is a large herbivorous mammal.

Sivapithecines were a group of primates that lived during the Miocene epoch.