Elmer sits next to 4 phonetic neighbors — Elma, Elma, and Alma 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"
"washed, cleansed; or variant of Lavinia"
"luminous, shining (via Lucinda)"
"to soothe, to comfort"
"numbness, the narcissus plant"
"bright, famous"
"settlement of the Britons"
"variant of Chloris, goddess of flowers"
"king"
"battle horn"
"meadow on a ledge"
"little light"
"prosperous friend"
"champion"
"mercy, clemency"
"of Rome, Roman woman"
"wonderful, to be admired"
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.