Rolf Scamander

Rolf Scamander was a magizoologist and the grandson of Newt Scamander and his wife Porpentina. He married fellow naturalist Luna Lovegood, and the couple had twin sons named Lorcan and Lysander.

Luna Lovegood
Luna is Rolf's wife, and they presumably met out of Hogwarts. They were both naturalists and both spent their time "globetrotting and looking for weird creatures". Rolf had two sons with Luna; both were born "considerably later" than the children of Harry Potter and their other friends.

Sons
Rolf and Luna had twin sons, Lorcan and Lysander.

Etymology
Rolf is a name, formed from the words hrodr and ulf, meaning "honour" and "wolf", respectively. His name therefore means "Honourable wolf".

Appearances

 * J.K. Rowling: A Year in the Life