Leonida sits next to 3 phonetic neighbors — Leonidas, Leonor, and Leonia are the closest matches by sound. Most share Leonida's Italian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"lion-like"
"ancestral heritage (via Olaf)"
"rose, flower"
"from the kingdom of Lothar, from the Lorraine region"
"faith"
"from Lucena, city of light"
"the third month, heralding spring"
"One who tends or holds; occupational name related to tenner"
"lily, rose"
"ruling glory"
"alder tree, from the alder grove"
"Honey bee; sweet and industrious one"
"famous, renowned"
"of silver, silvery"
"upright child; righteous child"
"Supplanter"
Similar sound: These names share phonetic patterns with Leonida — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Leonida.
Rhythm: Leonida is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.