Boris sits next to 4 phonetic neighbors — Morris, Doris, and Norris are the closest matches by sound. Most share Boris's Russian-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"battle glory"
"from the wealthy estate, prosperous settlement"
"God-given"
"unconquered, victorious"
"victory of the people"
"fort at Luguvalium"
"guardian, watchman"
"highland man"
"bright-headed"
"champion, winner"
"Winda's homestead, windy village"
"little one"
"from Ilium, ancient Troy"
"God has shown favor"
"surname used as given name"
"supreme, excellent"
Similar sound: These names share phonetic patterns with Boris — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Proto-Slavic origins, giving them the same cultural heritage as Boris.
Rhythm: Boris is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.