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"
"hazelnut, little bird"
"goodness, mother"
"soft-haired, youthful"
"dark, black"
"from Halle, Germany"
"vow to God"
"choral song"
"flower named for botanist Pierre Magnol"
"of noble lineage"
"small bird (the wren)"
"grace, divine favor"
"strong, healthy, from the Latin valere"
"head of the clan"
"born at night"
"person from Scotland"
"God will add; God increases"
"sublime, high, exalted"
"whole, universal"
"grace, favor"
"strong man of God"
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.