the Berasit Hebrew Dictionary

יהודימ

The 'ihodim' are the people of Ihoh. The very closely related word ihodeh (typically rendered “Judah” or Judea“) appears to refer to the same people in a more nationalistic way that might be more accurately rendered as “the Nation of the People of Ihoh”

This may refer to the heyeberi people in general, or possibly a subset of the heyeberi who actively served Ihoh.

The contextual evidence is clear that the followers of Ihoh are referred to, which raises an etymological/grammatical precedent for letter substitution before the im suffix