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"
"huckleberry berry plant"
"of the royal dynasty"
"flowing down, descend"
"little fire; battle-worthy"
"graced by God"
"from the brae (hillside) + lin (pool)"
"marsh dweller"
"friend of the army, warrior's friend"
"dark-haired"
"from the kaupa (trading) land"
"God has given"
"nonconformist, free spirit"
"firebrand, burning torch"
"muddy farm or settlement"
"modern invented spelling"
"bold counsel, brave advisor"
"world ruler"
"invented name, possibly faithful or gentle"
"son of Garret, son of the spear bearer"
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.