Remember the two verb-pattern situations: a specifically verbal pattern transferred into a proper name, or a shared pattern meeting the author’s prefix-letter and feminine-ending tests.
The source examples are Shammar, Ḍarab, Aḥmad, Yashkur, Taghlib and Nargis.
An ordinary diptote name is nominative with ḍamma, accusative with fatḥa and genitive with fatḥa, without tanwīn.
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Diptote Causes — Verb Patterns and Their Conditions
Remember the two verb-pattern situations: a specifically verbal pattern transferred into a proper name, or a shared pattern meeting the author’s prefix-letter and feminine-ending tests.
The source examples are Shammar, Ḍarab, Aḥmad, Yashkur, Taghlib and Nargis.
An ordinary diptote name is nominative with ḍamma, accusative with fatḥa and genitive with fatḥa, without tanwīn.