Correct spelling for the English word "Gueber" is [ɡˈɛbə], [ɡˈɛbə], [ɡ_ˈɛ_b_ə] (IPA phonetic alphabet).
The word "Gueber" comes from the Middle Persian term "Gubār", which means "pitch" or "tar". It is initially derived from the Avestan word "gao-barəna", where "gao" refers to "live" or "cow", and "barəna" means "giving birth". In Zoroastrianism, "Gueber" (also spelled "Guebre" or "Gabr") became an appellation for non-Zoroastrian people, particularly referring to fire-worshiping communities or those that followed Zoroastrianism's ancient rituals. Over time, the term developed a negative connotation and was primarily used by Muslims to refer to non-Muslims, especially Zoroastrians.