Sender sits next to 3 phonetic neighbors — Sander, Alexander, and Zander are the closest matches by sound. Most share Sender's Greek via Yiddish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"defender of men"
"defender of mankind"
"father is a lamp/candle"
"father of King David"
"boundless, infinite, immeasurable"
"illusion, magic"
"life, alive"
"beloved, good"
"proclaimer of peace"
"gift of YHWH"
"China, land of the Khitan"
"divine gift, blessing from God"
"weapon, sword"
"my light (variant of Lior)"
Similar sound: These names share phonetic patterns with Sender — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Yiddish origins, giving them the same cultural heritage as Sender.
Rhythm: Sender is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.