Ryan sits next to 4 phonetic neighbors — Ryann, Rylan, and Raina are the closest matches by sound. Most share Ryan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"little king"
"the end, night rain"
"defender of people"
"divine, moon goddess"
"the other, foreign (one)"
"protector of men"
"from Brittany, land of the Britons"
"ambergris, waxy substance"
"dream, aspiration, vision"
"little"
"with a web over her face"
"seven, completeness, divine perfection"
"lord, master"
"from the city of Larisa"
"a day's travel (original etymology)"
"gift from God"
"variant of Jackie or Casey"
"noble and gracious"
"jazz music + beauty"
"invented name; possibly related to 'life'"
"exultant, glad"
Similar sound: These names share phonetic patterns with Ryan — 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 Ryan.
Rhythm: Ryan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.