Eythan sits next to 3 phonetic neighbors — Ethan, Aidan, and Etan are the closest matches by sound. Most share Eythan's Hebrew-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"strong, enduring"
"peace"
"from the Roman family Terentius"
"narrow strait"
"my God is help"
"related to Thor (thunder)"
"son of the firebrand"
"immortality, eternal life (symbolic)"
"sacred song, hymn"
"son of Peter (son of the rock)"
"bright pledge, noble hostage"
"prince (from Arabic amir root)"
"from the dale, valley dweller"
"God has remembered"
"strip-shaped clearing in woodland"
"jewel of God, adorned by God"
"the Lord remembers"
"truly brave"
"Macks settlement"
"land desiccated from water"
"diminutive of Scott"
Similar sound: These names share phonetic patterns with Eythan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Eythan.
Rhythm: Eythan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.