Kulthum
Yes. Kulthum is a classical Arabic name attested among early Muslim women and preserved in Arabic biographical literature; it is used historically across Muslim societies.
Linguistically it denotes a full or rounded face—often glossed as 'full‑faced' or 'round‑cheeked'—from classical Arabic usage.
Traditional early Islamic sources record women named Kulthum among the Prophet’s household and among early notable families; the name appears in hadith and biographical collections.
No. Kulthum is less common in contemporary naming but remains in use in some communities that favor classical Arabic names.
In practice families may use affectionate forms like Kulsu, Kulu, or the Turkish/Ottoman style Kulsum, but the classical form Kulthum is the historically attested name.