Wellington sits next to 3 phonetic neighbors — Ellington, Pennington, and Harrington are the closest matches by sound. Most share Wellington's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the wealthy estate, prosperous settlement"
"modern invented variant"
"little fire, flame"
"truth, sound"
"discerning, perceptive"
"valley dweller"
"not known, unidentified"
"sincere, genuine"
"high and mighty, chief"
"air, breath of life"
"dark warrior, little dark chieftain"
"ruler of the people"
"victory of the people"
"indivisible, uncuttable"
"champion, winner"
"dog (loyal companion)"
"bone"
"reborn, renewed"
"sun and sea (Hawaiian compound)"
"sword, blade"
"completion, eternity"
Similar sound: These names share phonetic patterns with Wellington — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English 'Weola-ingtun' origins, giving them the same cultural heritage as Wellington.
Rhythm: Wellington is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.