Sven sits next to 3 phonetic neighbors — Sten, Swen, and Sveinn are the closest matches by sound. Most share Sven's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"young warrior, young man"
"from Laurentum (city of laurels)"
"diminutive of Hans (John)"
"priceless, of inestimable worth"
"estate ruler, powerful home"
"church, one who lives by a church"
"thunder"
"of the forest, woodland"
"little rock, harmony"
"belonging to Christ"
"chamber, enclosed space"
"lover of horses"
"army friend, honorable companion"
"army man, soldier"
"rulers advisor, mighty counselor"
Similar sound: These names share phonetic patterns with Sven — 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 Sven.
Rhythm: Sven is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.