Autumn sits next to 3 phonetic neighbors — Auburn, Austin, and Audrey are the closest matches by sound. Most share Autumn's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"the fall season"
"noble, nobility"
"fidelity, loyalty"
"song, musical tune"
"island"
"may God increase"
"king's wood; royal clearing"
"epithet of Demeter, goddess of grain"
"ivy plant"
"seductive, alluring"
"rival, eager"
"exalted, lofty, sublime"
"praise the Lord, variant of Hallelujah"
"musician, entertainer"
"from Ever's meadow"
"rose flower, the plant"
"night"
"plain, flat area, field"
"laurel tree"
"royal fortress meadow"
"Pacca's town"
Similar sound: These names share phonetic patterns with Autumn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin (autumnus) origins, giving them the same cultural heritage as Autumn.
Rhythm: Autumn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.