Elmer sits next to 3 phonetic neighbors — Almer, Palmer, and Elber are the closest matches by sound. Most share Elmer's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"noble and famous"
"son of Henry"
"one who lives near the fens or marshes"
"faithful, loyal, trustworthy"
"always, at all times"
"where the sun sets"
"sea"
"born of fire (head of fire)"
"man from Hadria"
"eternal, immortal"
"wolf counsel"
"pear tree"
"earnestness, sincerity"
"spiritually reborn through baptism"
"son of Bron"
"he gave, gift"
"the sound"
"victorious protection (Sigmund root)"
"free man (via Carson)"
"cedar tree, resinous wood"
Similar sound: These names share phonetic patterns with Elmer — 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 Elmer.
Rhythm: Elmer is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.