Ivar sits next to 4 phonetic neighbors — Ivan, Iver, and Ivor are the closest matches by sound. Most share Ivar's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"yew warrior, bow warrior"
"God is gracious"
"god spear"
"son of Jens (John)"
"alder tree"
"free man, strong man"
"a musical lament (the linos song)"
"home power, estate ruler"
"calm, peaceful"
"power of peace"
"bold, daring (thunder-bold)"
"defender of men"
"son of Ivar (yew warrior)"
"shoulder, axle (folk etymology)"
"priceless, praiseworthy"
"sky, heavens"
Similar sound: These names share phonetic patterns with Ivar — 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 Ivar.
Rhythm: Ivar is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.