Charles Ellicott Commentary 1 Chronicles 11:36

"Hepher the Mecherathite, Ahijah the Pelonite," — 1 Chronicles 11:36 (ASV)

Hepher the Mecherathite. — This name is absent from the current text of Samuel. Mecherah is unknown as a place, and a comparison with Samuel (1 Chronicles 11:34) suggests “Hepher the Maachathite,” that is, of Abelbeth-Maachah, or perhaps the Syrian state of Maachah (2 Samuel 10:8).

Ahijah the Pelonite. — Instead of this, Samuel has “Eliam son of Ahithophel the Gilonite.” For Ahithophel, see 2 Samuel 15:31.

The Pelonite — that is, so-and-so, may indicate either that Ahithophel’s name had become obscure in the chronicler’s manuscript, or that he was unwilling to mention the traitor. Ahijah (Jah is a brother) and Eliam (God is a kinsman) might be names of one person.