Quimbois, magie noire et sorcellerie aux Antilles : avec 61 pantacles et sceaux magiques / Ary Ebroïn. (OCLC #3514396)

RDA 8.5.4 on Accents and Other Diacritical Marks in names says to record them as they appear on the source of information, like:

100 1_ ǂa Ebroïn, Ary.

In OCLC Connexion, you can type characters with diacritics by typing the unaccented character, and then adding the diacritic with Edit -> Enter diacritics… (Ctrl-E). Pasting in pre-composed characters from another source will produce an error about data needing to be ALA characters.