“The Tachmonite” refers to Jashobeam, a chief among David’s mighty men. The wording is uncertain, and the parallel account identifies him as Jashobeam the Hachmonite.
Definition
“The Tachmonite” is a designation associated with Jashobeam, David’s chief warrior. The parallel account calls him Jashobeam the Hachmonite, or possibly the son of Hachmoni. The wording in Samuel is considered corrupt in the supplied material.
Biblical Usage
The phrase appears in the account of David’s chief captains and identifies the warrior whom the parallel record names Jashobeam.
Historical Background
The proposed correction replaces “the Tachmonite that sat in the seat” with “Jashobeam the Hachmonite.” Hachmonite is understood as a family or local name.
Historical Bible Dictionaries
Smith's Bible Dictionary
“The Tachmonite that sat in the seat,” chief among David’s captains, (2 Samuel 23:8) Isa in 1Chr 11:11 Called “Jashobeam an Hachmonite,” or, as the margin gives it, “son of Hachmoni.” Kennicott has shown that the words translated “he that sat in the seat” are a corruption of Jashobeam, and that “the Tachmonite” is a corruption of the “son of Hachmoni,” which was the family or local name of Jashobeam. Therefore he concludes “Jashobeam the Hachmonite” to have been the true reading.