Rowan sits next to 3 phonetic neighbors — Owen, Roman, and Rowen are the closest matches by sound. Most share Rowan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little red-haired one"
"from the hollow"
"ruler of the elves"
"beloved, dear"
"father of peace"
"riverbank, shore"
"Scottish form of John, gift of God"
"brave as a lion"
"from Lucania (ancient region of Italy)"
"keeper of the keys"
"horseman, knight"
"of uncertain origin, possibly barberry hill"
"the blessed one"
"Yahweh is deliverance"
"he who carries the heavens"
"little fire"
"priest"
"lion-hearted, brave"
"to flow down, descend"
"my God is the Lord"
"appointed by God"
Similar sound: These names share phonetic patterns with Rowan — 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 Rowan.
Rhythm: Rowan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.