Agan sits next to 4 phonetic neighbors — Egan, Hagan, and Logan are the closest matches by sound. Most share Agan's Turkic-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"field, open meadow"
"giant, powerful one"
"strength, authority"
"battle to the death, earnestness"
"Of God; divinely seen"
"elevated, lofty"
"A standing position; one who holds their ground; a firm attitude"
"bright valley"
"God's victory, victory of the Lord"
"to rise up, come forth"
"winding stream, crooked well"
"character, virtuous disposition"
"chalk wharf, limestone landing"
"river crossing dweller"
"God"
Similar sound: These names share phonetic patterns with Agan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Turkic origins, giving them the same cultural heritage as Agan.
Rhythm: Agan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.