Eldon sits next to 5 phonetic neighbors — Alden, Elton, and Elden 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
"Ella's hill, Elli's hill"
"of the Chiel family"
"noble spear (Edgar-derived)"
"son of Gerald"
"God is gracious"
"harmony, concord"
"powerful ruler of the household"
"rich, powerful ruler"
"fair warrior"
"rope maker, cord seller"
"defender of men (short for Alexander)"
"green/fresh river"
"of Mars, warrior"
"hero, brave warrior"
"God has remembered"
"warrior, strong one"
"powerful, bright-headed warrior"
"highest point, fortified hill"
"possibly from dragon + valley"
"thankful"
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.