Doyle sits next to 4 phonetic neighbors — Dale, Joy, and Royal are the closest matches by sound. Most share Doyle's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"descendant of the dark stranger"
"twin"
"son of the champion"
"truly supernatural; elf-true"
"famous warrior"
"noble friend"
"hunter (possible Greek derivation from Theron)"
"farmer, earth worker"
"noble friend"
Similar sound: These names share phonetic patterns with Doyle — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Irish Gaelic origins, giving them the same cultural heritage as Doyle.
Rhythm: Doyle is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.