Elis sits next to 4 phonetic neighbors — Ellis, Elias, and Eli are the closest matches by sound. Most share Elis's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"my God is an oath"
"handsome son"
"crystal, sparkle"
"the shining one, bright sky"
"little poet"
"lake colony, Roman settlement by the pool"
"the Lord is righteous"
"ruler, sovereign (Greek/Latin influence on Tyrant root)"
"red-haired counselor"
"one who covers"
"man from South Munster (Ireland)"
"pre-dawn wisdom"
"one who lives in a valley"
"settlement on a hill"
"strong, firm, enduring"
"from Leamhanaich (elm grove place)"
"fire of Yahweh"
"strong decision-maker"
"dream, prophetic sight"
"long hill, ridge settlement"
Similar sound: These names share phonetic patterns with Elis — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew origins, giving them the same cultural heritage as Elis.
Rhythm: Elis is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.