Declense

In moorish vulgar Arabic there is no true declensing because the final sings are suppressed; See page 13 N°- 30, one form alone being vulgarly used for all the cases in determinate as well as indeterminate nouns.

I reckon that Lichtenstein had found a Latin genitive abdimi ('of Abdim') but thought it was in the nominative case, not yet declensed in the genitive, and that the person's name was Abdimi, so he applied yet again a Latin genitival suffix.