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)"
"my God is Yahweh"
"olive tree, peace"
"the letter Z"
"counsel + guardian"
"thorny shrub, wild rose"
"man of the army"
"blessed, holy"
"forest dweller, one of the wood"
"worthy of being told in stories"
"flat-bladed digging tool"
"rye clearing"
"fame-land, renowned in the territory"
"thankful"
"earl, nobleman"
"man from South Munster (Ireland)"
"gift of healing"
"one who follows at the heel"
"tournament fighter, gladiator"
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.