Devon sits next to 4 phonetic neighbors — Devin, Devo, and Devon are the closest matches by sound. Most share Devon's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"deep valley dwellers"
"royal garland, heavenly wreath"
"poetic vision"
"field of gold"
"hero of God"
"prosperous, flourishing"
"new, fresh, little new thing"
"valley of the River Kent"
"flowing, ease"
"of Delos, born under Apollo's light (via Greek Delia)"
"wise, knowledgeable"
"hazel tree, nut-bearing shrub"
"songbird, one who sings joyfully"
"thankful, God has heard"
"modern blend of Taylor and -lyn suffix"
"elevated, sublime (by phonetic association with Aaliyah)"
"close companion of the heart"
"creative feminine variant of Kendal"
"son of Harry"
"land of oak trees"
"to esteem, to value"
Similar sound: These names share phonetic patterns with Devon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic origins, giving them the same cultural heritage as Devon.
Rhythm: Devon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.