Chemarims (idolatrous) priests

Boyd’s Bible Dictionary:

(black ones). Sun-worshippers (Zeph. 1:4).

Concise Bible Dictionary:

A Hebrew word signifying some class of “priests” (Zeph. 1:4 margin; Hos. 10:5). It is translated “idolatrous priest” in 2 Kings 23:5. The derivation of the word is much disputed.

Strong’s Dictionary of Hebrew Words:

Transliteration:
kamar
Phonic:
kaw-mawr’
Meaning:
from 3648; properly, an ascetic (as if shrunk with self-maceration), i.e. an idolatrous priest (only in plural)
KJV Usage:
Chemarims (idolatrous) priests

Jackson’s Dictionary of Scripture Proper Names:

as changed ones

Potts’ Bible Proper Names:

Blackness; sadness; mourning; an ascetic:―idolatrous priests, Zeph. 1:4. {Nigror}