Amabilis

Ama has origin in the word mother from the ancient near east, and is later seen in various words in Latin to mean (amare/amore) loving, friendly.

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So while the Latin Amabilis/mabel/maybel is the equivalent to Amiable, one could suggest that the meaning, specifically to Amabelle, is motherly, loving, or 'a beautiful mother'. This links closely to the name Anabel, Anna, and Hannah, which are often linked to mother figures such as Mary.