Addison sits next to 3 phonetic neighbors — Madison, Allison, and Emerson are the closest matches by sound. Most share Addison's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Adam"
"royal fortress meadow"
"ever clearing; eternal meadow"
"Rival; to emulate; eager"
"night"
"dweller at the hall meadow"
"daughter of the sun"
"dark beauty"
"golden light"
"helmeted chief"
"from the city of Siena"
"tower, high place"
"deep red, the color of passion"
"full of grace"
"grace in Igbo language"
"noble, of noble kind"
"warrior, raider"
"youthful, downy"
"great, noble (from botanist's surname)"
"land of the Aryans, noble"
"musical concord, agreement"
Similar sound: These names share phonetic patterns with Addison — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Addison.
Rhythm: Addison is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.