Felis sits next to 4 phonetic neighbors — Felix, Ellis, and Delis are the closest matches by sound. Most share Felis's Latin-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"happy, fortunate, blessed"
"Valley of the linden trees"
"pledge, servant"
"a thick bush or clump of ivy"
"valley dweller"
"of the forest people"
"just, equitable"
"dweller at the wood"
"gold, golden one"
"home ruler, powerful ruler"
"one who grows in virtue"
"Arc; bow; arch - from Latin arcus meaning bow or arch. In music, ar..."
"light (from Lucius)"
Similar sound: These names share phonetic patterns with Felis — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Felis.
Rhythm: Felis is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.