Oskar sits next to 4 phonetic neighbors — Oscar, Oskar, and Oliver are the closest matches by sound. Most share Oskar's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"divine spear, god's spear"
"overseer, tenant farmer"
"sun, lord"
"Armenian national name of uncertain origin"
"from the Roman gens Terentia"
"peace power"
"brave in counsel"
"descendant of the fair one"
"God is gracious"
"son of Dubhagan (little dark one)"
"bearer of Christ"
"gracious defender"
"defender of men"
"famous ruler"
"descendant of Riagán"
"incomparable to God"
"descendant of Aodh (fire)"
"greatest stream (via Maxwell)"
"cloud"
"universal, whole"
"consecrated by augury"
Similar sound: These names share phonetic patterns with Oskar — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse ás + geirr origins, giving them the same cultural heritage as Oskar.
Rhythm: Oskar is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.