Eoghan sits next to 3 phonetic neighbors — Owen, Ewan, and Ewen are the closest matches by sound. Most share Eoghan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"born of the yew tree"
"bard, sage"
"nobleman, patrician (via Patrick)"
"son of the sea"
"Short form of Uilliam, the Irish form of William"
"green, dark green (water)"
"from 'deaglán', possibly 'good man'"
"from Kansas City"
"one who wields prosperity"
"black, dark-featured"
"stony ford"
"strong, noble, virtuous"
"protector of people"
"descendant of Raghallach"
"little warrior"
"slender, graceful"
"son of Piers"
"man of prayer"
Similar sound: These names share phonetic patterns with Eoghan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Eoghan.
Rhythm: Eoghan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.