Shelby sits next to 4 phonetic neighbors — Chelsea, Kelsey, and Ashley are the closest matches by sound. Most share Shelby's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the willow farm"
"ambergris, waxy substance"
"laurel, victory crown"
"of the Tatius family"
"Trojan prince"
"bent river"
"great lord, magnificent ruler"
"honor (from Honoria)"
"great one, month of May"
"precious gemstone formed in oysters"
"hillside by the pool"
"scholar, learned one"
"noble kind, of noble birth"
"halo of light around the moon"
"defender of mankind"
"belonging to Clement"
"seven, completeness, divine perfection"
"divine radiance"
"the flowing river"
"ascent, going up"
"manly, brave"
Similar sound: These names share phonetic patterns with Shelby — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Shelby.
Rhythm: Shelby is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.