Elmo sits next to 4 phonetic neighbors — Elma, Alma, and Elba are the closest matches by sound. Most share Elmo's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"helmet, protection"
"dark-skinned, Moorish"
"Sweet and lovely as a peach; endearing and warm-spirited"
"flowering, flourishing"
"God is salvation"
"Wonder, miracle, something marvelous"
"love, beauty (via Latin Venus)"
"army, military equipment"
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 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.