Abaddon sits next to 3 phonetic neighbors — Aidan, Haddon, and Adan are the closest matches by sound. Most share Abaddon's English-origin cluster, so the rhythm and vowel shape carry across the list.
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"destruction, ruin"
"my pride, my genius, my eminence"
"blessed one"
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"Water of life; the distilled spirit drink"
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"king, ruler"
Similar sound: These names share phonetic patterns with Abaddon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Abaddon.
Rhythm: Abaddon is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.