جَاءَ ضَرَبُ. — A person named Ḍarab arrived.
جَاءَ: past verb, built on fatḥa.
ضَرَبُ: nominative subject, marked by ḍamma; here Ḍarab is a proper name transferred from a verb.
The name has no tanwīn because proper-name status combines with the relevant verbal pattern.
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Diptote Causes — Verb Patterns and Their Conditions
جَاءَ ضَرَبُ. — A person named Ḍarab arrived.
جَاءَ: past verb, built on fatḥa.
ضَرَبُ: nominative subject, marked by ḍamma; here Ḍarab is a proper name transferred from a verb.
The name has no tanwīn because proper-name status combines with the relevant verbal pattern.