Zeppelin sits next to 4 phonetic neighbors — Sebastian, Julian, and Emilien are the closest matches by sound. Most share Zeppelin's German-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rigid airship (named for Count Ferdinand von Zeppelin)"
"son of Nicholas, victory of the people"
"brave spear, strong with a spear"
"bright, radiant"
"divine bear"
"pledge of peace, divine peace"
"oracle, mouth of the serpent"
"son of Jack"
"lord (if related to Kyrie)"
"illuminance unit"
"deep gorge, ravine"
"emperor, ruler"
"soaring, high-flying"
"worth, worthiness"
"son of Peter (son of the rock)"
"house, home"
"joy, laughter"
"victory of the people"
"cross"
"ravager, one who destroys"
"valley dweller, from the valley"
Similar sound: These names share phonetic patterns with Zeppelin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have German (proper noun) origins, giving them the same cultural heritage as Zeppelin.
Rhythm: Zeppelin is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.