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.
You searched for names like
"destruction, ruin"
"little ruler"
"from the barley meadow (topographic)"
"my pride, my genius, my eminence"
"brave lion, lion-strong"
"Water of life; the distilled spirit drink"
"blessed one"
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.