Compare إِبْرَاهِيمُ with نُوْحٌ. إِبْرَاهِيمُ satisfies the stated foreign-name and letter conditions, whereas نُوْحٌ is an established three-letter, sakin-middle declinable form. The contrast shows why every proper name cannot be treated alike.
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Compare the Decision, Not Just the Appearance
Causes of Ghayr Munsarif: Proper Names and Foreign Origin
Compare إِبْرَاهِيمُ with نُوْحٌ. إِبْرَاهِيمُ satisfies the stated foreign-name and letter conditions, whereas نُوْحٌ is an established three-letter, sakin-middle declinable form. The contrast shows why every proper name cannot be treated alike.