Kazimir sits next to 4 phonetic neighbors — Casimir, Kasimir, and Vladimir are the closest matches by sound. Most share Kazimir's Polish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"proclaimer of peace"
"strong man, warrior"
"associated with Vladimir Lenin, revolutionary leader"
"champion of the people"
"perfect, complete"
"gift bearer"
"God is gracious"
"honorable"
"iron-willed, strong"
"lover of the earth"
"God-like, comparable to God"
"to protect, to defend"
Similar sound: These names share phonetic patterns with Kazimir — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Slavic origins, giving them the same cultural heritage as Kazimir.
Rhythm: Kazimir is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.