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"
"bearer of Christ"
"powerful (alternative interpretation)"
"powerful and brave"
"diminutive of Hans (John)"
"helmeted chief; armored head"
"world ruler"
"son of Adam"
"admirable, hawk-like"
"man of the people"
"who is like God? (rhetorical — implying no one)"
"God is gracious"
"will and fame"
"dark, black-haired"
"sun, lord"
"home ruler, lord of the house"
"linden tree, lime tree"
"fiery, ardent"
"Armenian national name of uncertain origin"
"his peace"
"one who shines, illuminates"
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.