Correct spelling for the English word "graeber" is [ɡɹˈiːbə], [ɡɹˈiːbə], [ɡ_ɹ_ˈiː_b_ə] (IPA phonetic alphabet).
The word "Graeber" appears to be derived from German, specifically from the word "Grab" which means "grave" or "tomb" in English. The feminine form of "Grab" is "Gräberin" which means "grave digger". Thus, "Gräber" is the plural form of "Gräberin" and refers to "grave diggers" or "undertakers" in English.