Lilli sits next to 4 phonetic neighbors — Lily, Lilly, and Lillie are the closest matches by sound. Most share Lilli's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lily flower"
"lake, beautiful"
"gentle horse"
"work, industrious"
"life"
"gracious gift"
"weary, delicate"
"generous one"
"unfortunate, unhappy"
"descendant of the fire god"
"lily (flower)"
"rocky terrain"
"courageous, brave (via Riley)"
"fresh, pure"
"gift from God"
"woodland meadow clearing"
"gift of God"
"wise protection"
"prosperous, flourishing"
"pleasing to the senses, physically attractive, excellent"
"sky, heaven (French ciel + -elle suffix)"
Similar sound: These names share phonetic patterns with Lilli — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Lilli.
Rhythm: Lilli is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.