Which were expressed by name. — See the same phrase, 1 Chronicles 16:41; Numbers 1:17. Literally it is pricked down, or entered in a list, by names. The men had been levied by the tribal chiefs, and enrolled in lists for this particular service.
Related Commentaries of 1 Chronicles 12:31
1 Chronicles 12:31
31 And of the half tribe of Manasseh eighteen thousand, which were expressed by name, to come and make David king.