Viggo sits next to 3 phonetic neighbors — Hugo, Nico, and Rocco are the closest matches by sound. Most share Viggo's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"war, battle"
"bold counsel, brave advisor"
"wolf, wild hunter"
"ancestor descendant"
"will and fame"
"enclosed pasture, fortified place"
"he judged, he governed"
"divine reward"
"secret, mystery"
"fisherman"
"god's field, divine meadow"
"Armenian national name of uncertain origin"
"God is gracious"
"gift of God"
Similar sound: These names share phonetic patterns with Viggo — 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 Viggo.
Rhythm: Viggo is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.