In the modern eastern Aramaic dialects, the family relation terms for offspring and siblings with originally diminutive endings such as this one are used for simple relationship terms, e.g.
brona "son",
xunta "sister" in addition to this word for brother. So absent further investigation it is unclear whether the diminutive force of these words was already weakening in the classical period. Note the form
ˀḥwnwnˀ and the comment there.