Ollie sits next to 4 phonetic neighbors — Oliver, Allie, and Molly are the closest matches by sound. Most share Ollie's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"olive tree"
"charming, wily"
"promised land, heavenly realm"
"ancient, enduring"
"protector of mankind"
"of the angel, son of Angelo"
"descendant of Otto"
"resolute protector"
"son of the firebrand"
"son of fire"
"known by God"
"rest, comfort (when used as variant of Noah)"
"love, romance"
"resolute, crafty"
"the number seven, representing luck and completeness"
"prestige, luxury (cultural association)"
"brave in battle"
"Trent's town, settlement on the Trent"
"golden, gilded, of gold"
Similar sound: These names share phonetic patterns with Ollie — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin via English origins, giving them the same cultural heritage as Ollie.
Rhythm: Ollie is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.