Oliver sits next to 3 phonetic neighbors — Olivier, Elliot, and Owen are the closest matches by sound. Most share Oliver's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"olive tree"
"son of Jack"
"soldier"
"tile maker, brick layer"
"manly, brave"
"one who carries the divine"
"little fire"
"descending"
"From the Scottish place name Logan; a topographic name from Gaelic ..."
"the blessed one"
"son of Harry (Henry)"
"cloth walker, one who treads cloth"
"venerable, sacred"
"flowing body of water"
"sea"
"Gaelic-speaking person; Celtic person"
"God has remembered"
"God supports, Yahweh heals"
"God is gracious"
Similar sound: These names share phonetic patterns with Oliver — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Oliver.
Rhythm: Oliver is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.