Because the Arabic alphabet maps imperfectly onto the Latin one, هيباء appears in many spellings: Hayba, Haybaa, Haiba, Haibaa, and the scholarly haybāʾ. The doubled aa in Haybaa marks the long final vowel for general readers, while academic systems use macrons and the hamza symbol ʾ.
For research, the practical rule is to search every major variant alongside the Arabic script form. Passports, civil registries, and social platforms each freeze a different spelling, so one person may be findable only under a variant different from the one a researcher expects.