Matthew Henry Presbyterian @wholebiblehenry

Here is a short account of the short and inglorious reign of Amon, the son of Manasseh. Whether Manasseh, in his blind and brutish zeal for his idols, had sacrificed his other sons - or whether, having been dedicated to his idols, they were refused by the people - so it was that his successor was a son not born till he was forty-five years old.

Commenting on 2 Kings 21:19-26

John Gill Reformed Baptist @doctorgill

And he did that which was evil in the sight of the Lord,.... Committed idolatry: as his father Manasseh did: he imitated him in that, but not in his repentance and humiliation, Ch2 33:23.

Keil & Delitzsch Lutheran @keilanddelitzsch

2Ki 21:19-22 Reign of Amon (cf. 2Ch 33:21-25). - Amon reigned only two years, and that in the spirit of his father, that is to say, worshipping all his idols. The city of Jotbah, from which his mother sprang, was, according to Jerome (in the Onom. s. v. Jethaba), urbs antiqua Judaeae; but it is not further known.

Commenting on 2 Kings 21:19-22