Coyle sits next to 4 phonetic neighbors — Kyle, Cole, and Doyle are the closest matches by sound. Most share Coyle's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pledge, servant"
"cat genus name"
"descendant of the red one"
"dweller near a cliff or rocky place"
"a thick bush or clump of ivy"
"gold, golden one"
"white clay, potter's clay"
"of the forest people"
"linden tree settlement"
"light-haired, pale-complexioned"
"sandy shore, coastal land"
"Council friend; chief; variant of Melvin"
Similar sound: These names share phonetic patterns with Coyle — 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 Coyle.
Rhythm: Coyle is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.