Oleander sits next to 3 phonetic neighbors — Alexander, Leander, and Orlando are the closest matches by sound. Most share Oleander's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"olive tree + man (Greek etymology)"
"One who drives; hunter"
"God will uplift"
"descendant of Nuallán"
"valley settlement"
"curved, hook-nosed"
"bright town"
"a rousing song of praise or national identity"
"strong, healthy"
"treasurer, keeper of treasure"
"lord, master"
"divine protection"
"gift of healing"
"foot (of Orion)"
"from the narrow forest"
"one who covers"
"to tame, subdue"
"from the town by the sea"
"one who lays slates, roofer"
"brother, brotherly"
"advice, counsel"
Similar sound: These names share phonetic patterns with Oleander — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Oleander.
Rhythm: Oleander is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.