Thaddaios is used as the personal name listed among the disciples in the Gospel apostle lists.

The term is attested as a personal name within lists of disciples, appearing alongside the other named men in Mark 3:18 and Matthew 10:3.

1. Personal name in disciple lists · dominant

   In Mark 3:18, the accusative singular masculine form occurs within a sequence naming Andrew, Philip, Bartholomew, Matthew, Thomas, James, Thaddaeus, and Simon; the APB renders the list with “Thaddaeus.” In Matthew 10:3, the nominative singular masculine form likewise stands in a list with Philip, Bartholomew, Thomas, Matthew, and James; the APB again renders “Thaddaeus.”

   Mark 3:18Matthew 10:3

In the Anselm Project Bible: Across Mark 3:18 and Matthew 10:3, the APB presents the name as “Thaddaeus” in lists of disciples. The verse is read as a whole, but both verses visibly include that name in the list.