Oslo sits next to 4 phonetic neighbors — Arlo, Otto, and Cosmo are the closest matches by sound. Most share Oslo's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"meadow of the gods"
"calm, tranquility"
"settlement by the sea"
"river in Peru"
"advice, counsel"
"God will save"
"lead metal, dense and enduring"
"I am, self-existence, declaration of being"
"thorny shrub, wild rose"
"my rock is God"
"son of Evan"
"of noble origin"
"from Scotland, Scotsman"
"wild garlic island"
"God is gracious and humble"
"bright, splendid"
"treasurer, keeper of treasure"
"eternal"
"God is just, justice of God"
"righteous, just"
"God is gracious (related to Yohanan)"
Similar sound: These names share phonetic patterns with Oslo — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Oslo.
Rhythm: Oslo is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.