The initial hamza can serve different functions. In أَزَيْدُ، أَقْبِلْ! it is vocative, and Zayd is a singular proper-name vocative, built on ḍamma in an accusative position.
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Interrogation vs Vocative
The Two Interrogative Particles: Hamza and Hal
The initial hamza can serve different functions. In أَزَيْدُ، أَقْبِلْ! it is vocative, and Zayd is a singular proper-name vocative, built on ḍamma in an accusative position.