Jochen sits next to 3 phonetic neighbors — Joachim, Johan, and Joshua are the closest matches by sound. Most share Jochen's German-origin cluster, so the rhythm and vowel shape carry across the list.
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"coined American name; no classical etymology"
Similar sound: These names share phonetic patterns with Jochen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Hebrew Yehoyaqim origins, giving them the same cultural heritage as Jochen.
Rhythm: Jochen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.