Shammah the Harodite - There are several varieties in the names of the following shalishim; which may be seen by comparing these verses with 1-Chronicles 11:27.

Shammah the Harodite,.... Called Shammah the Harorite in 1-Chronicles 11:27; by a change of the letters "R" and "D", which is frequent:
Elika the Harodite; or who was of Harod, as the Targum; these both were from one place: mention is made of the well of Harod, Judges 7:1.

Harodite - In 1-Chronicles 11:27, Shammoth the Harorite. Concerning which, and other changes of the names, which will be observed, by comparing this catalogue with that, it will be sufficient to suggest, that the same names of persons, or places, are differently pronounced according to the different dialects of divers places or ages. That one man had often two names. That David had more worthies than those here mentioned; and as some of these were slain in the former part of David's reign, as Asahel was; so others came up in their stead; and some were added to this number, as appears from 1Ch. 11:10-47, where they are named, but not numbered, as they were here; and where there is a greater number than is here expressed.