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"
"he causes pain, born in sorrow"
"symbol of limitless abundance"
"industrious ruler"
"fortunate, prosperous"
"my God is Yahweh"
"rye farmer"
"rising, ascending"
"great woodland clearing"
"man of the army"
"the Lord is righteous"
"Brock's settlement (place name origin)"
"water sprite, water spirit"
"to twist, to wrestle with"
"God is my joy"
"olive tree, peace"
"large town, community"
"manly, masculine"
"he who descended, to descend"
"my God is Yahweh"
"handsome son"
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.