مَرَرْتُ بِزَيْدٍ — I passed by Zayd.
مَرَرْتُ: past-tense verb with its subject pronoun.
بِ: preposition.
زَيْدٍ: genitive noun, marked by a visible kasra and tanwīn.
Thus, a noun can be both a proper name and fully declinable.
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Parsing Zayd in the Genitive
Definiteness and Proper-Name Status in Diptote Rules
مَرَرْتُ بِزَيْدٍ — I passed by Zayd.
مَرَرْتُ: past-tense verb with its subject pronoun.
بِ: preposition.
زَيْدٍ: genitive noun, marked by a visible kasra and tanwīn.
Thus, a noun can be both a proper name and fully declinable.