Easton's Bible Dictionary
It is probable that in these cases Hadar may be an error simply of transcription for Hadad.
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Hadar'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/h/hadar.html. 1897.