Theophylact of Ohrid

Andrew is in the same perplexity that Philip is; only he has rather higher notions of our Lord: There is a lad here which hath five barley loaves and two small fishes. This passage confounds the Manicheans, who say that bread and all such things were created by an evil Deity. The Son of the good God, Jesus Christ, multiplied the loaves. Therefore they could not have been naturally evil; a good God would never have multiplied what was evil.

Catena Aurea by Aquinas ↗

Augustine of Hippo

Andrew's suggestion about the five loaves and two fishes, is given as coming from the disciples in general, in the other Evangelists, and the plural number is used.

Catena Aurea by Aquinas ↗

Thomas Aquinas

Andrew, however, seems to sense that a miracle is going to take place. Perhaps he recalled the miracle performed by Elisha with the barley loaves, when he fed a hundred men with twenty loaves (2 Kgs 4:42). And so he says, There is a boy here who has five barley loaves. Still, he did not suspect that Christ was going to perform a greater miracle than Elisha: for he thought that fewer loaves would be miraculously produced from fewer, and more from a larger number. …

Commentary on John ↗

Bonaventure

Here is noted the fourth occasion, namely the insufficiency of food for the feeding of so great a multitude. For since there were five thousand, they had only five loaves; and this is noted in Andrew's response. Therefore he says: "One of his disciples, Andrew, the brother of Simon Peter, says to him," namely to the Lord, who was asking Philip about the feeding of the crowds.

Commentary on John, Chapter 6 ↗