Tilly sits next to 4 phonetic neighbors — Millie, Lily, and Tillie are the closest matches by sound. Most share Tilly's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"strength in battle"
"queen"
"life"
"maiden, young girl"
"beautiful, pretty"
"dream, vision"
"to be of worth, to be strong"
"of the Antonius family"
"blessed"
"mother goddess"
"praised, she will be praised"
"reward, wages"
"May meadow, spring clearing"
"defender of mankind"
"rock, cliff"
"from the city of Laurentum"
"world-encircling river"
"pure"
"from the Danish valley passage"
"who is like God?"
"throne, sun (alternate Persian/Greek etymology)"
Similar sound: These names share phonetic patterns with Tilly — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Tilly.
Rhythm: Tilly is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.