Augustine of Hippo

With respect to the name of Judas the brother of James, Luke seems to differ from Matthew, who calls him Thaddaeus. But what prevented a man from being called by two or three names? Judas the traitor is chosen, not unwittingly but knowingly, for Christ had indeed taken to Himself the weakness of man, and therefore refused not even this share of human infirmity. …

Catena Aurea by Aquinas ↗

Ambrose of Milan

Judas too is chosen, not through inadvertence but through Providence. How great is the truth that not even a hostile minister weakens! How great is the integrity of the Lord, who preferred to endanger his judgment among us, rather than his compassion! For he had assumed the frailty of man, and therefore [he did not] refuse those aspects of human weakness. …

Commentary on Luke ↗

Bede

Judas of James, and Judas Iscariot, who was the traitor. And for the sake of distinction, he doubled the names. One of whom, as he himself writes in the catholic Epistle, is the brother of James, who was also called Thaddaeus. The other took his name either from the village in which he was born, or from the tribe of Issachar as a premonition of his condemnation. For Issachar, which means "reward," hints at the price of betrayal. …

On the Gospel of Luke ↗