Elmo sits next to 3 phonetic neighbors — Elmo, Aldo, and Almo are the closest matches by sound. Most share Elmo's Italian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"Gods helmet, divine protection"
"little rose"
"from Lancy, from the lancet-shaped place"
"younger son, junior member"
"spear"
"ash tree settlement (variant of Ashton)"
"battle warrior, powerful ruler"
"bright meadow, shire clearing"
"red-haired, ruddy"
Similar sound: These names share phonetic patterns with Elmo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic helm/Anselmo origins, giving them the same cultural heritage as Elmo.
Rhythm: Elmo is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.