The spelling of the word "reiman" is not a commonly used term in English, and it is not found in most dictionaries. However, it appears that this word could refer to a German surname "Reiman" which is pronounced as /ˈraɪmən/. The IPA phonetic transcription helps to explain the pronunciation of the word, with the symbol /ə/ representing the schwa sound often found in unstressed syllables, and /aɪ/ representing the diphthong sound similar to "eye". Without further context, it is difficult to determine the precise meaning or origin of "reiman".