Smith's Bible Dictionary
Tach'monite, The. "The Tachmonite that sat in the seat," chief among David's captains, 2 Samuel 23:8, is in 1 Chronicles 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.
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Smith, William, Dr. Entry for 'Tachmonite The'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/t/tachmonite-the.html. 1901.