Eldon sits next to 5 phonetic neighbors — Elton, Alden, and Edna are the closest matches by sound. Most share Eldon's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"noble hill; Ella hill"
"contemplation, beholding"
"free man"
"of the elder tree"
"daughter of Zeus, Titaness"
"pure"
"will helmet"
"from Venice"
"from the green woodland clearing"
"sea sparkle"
"faithful, honest, genuine"
Similar sound: These names share phonetic patterns with Eldon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Eldon.
Rhythm: Eldon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.