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"
"little one"
"fort at Luguvalium"
"given by God"
"to guard, to protect"
"from Ilium, ancient Troy"
"champion, winner"
"manly, courageous, strong"
"people's champion"
"surname used as given name"
"supreme, excellent"
"man of Armenia, Armenian"
"God has shown favor"
"from the wealthy estate, prosperous settlement"
"Winda's homestead, windy village"
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.