Mell sits next to 4 phonetic neighbors — Mel, Bell, and Dell are the closest matches by sound. Most share Mell's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"honey, sweet"
"warrior, army man"
"the solar deity"
"fairy maiden, elf"
"son of Jack, God is gracious"
"a plaything, a source of joy"
"meadow of the holly tree"
"river crossing dweller"
"exalted, noble, high"
"moral principles, code of conduct"
"one of the Vandal people"
"western land, western meadow"
Similar sound: These names share phonetic patterns with Mell — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin mel / Welsh mêl origins, giving them the same cultural heritage as Mell.
Rhythm: Mell is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.