أَنْ يَكُونَ عَلَمًا
Translation: It must be a proper name.
A proper name identifies a particular person or place. Baʿlabakk names a particular city, so it possesses proper-name status.
Putting words together does not by itself produce the diptote rule; the expression must also function as a name.
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Diptote Causes — Compounding and Its Conditions
أَنْ يَكُونَ عَلَمًا
Translation: It must be a proper name.
A proper name identifies a particular person or place. Baʿlabakk names a particular city, so it possesses proper-name status.
Putting words together does not by itself produce the diptote rule; the expression must also function as a name.