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"
"Yahweh saves"
"flowering, flourishing"
"Wonder, miracle, something marvelous"
"army, military equipment"
"Sweet and lovely as a peach; endearing and warm-spirited"
"dark-skinned, Moorish"
"love, beauty (via Latin Venus)"
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.