In "Puella Magi Madoka Magica", what is the first name of Madoka's younger brother?

In the anime "Puella Magi Madoka Magica," the first name of Madoka's younger brother is Tatsuya. Tatsuya is introduced in the series as a supportive and caring sibling to Madoka. While his role in the story is not as prominent as Madoka's, he provides emotional comfort and adds to the family dynamics, emphasizing their close-knit bond.