Otto sits next to 3 phonetic neighbors — Otis, Arlo, and Hugo are the closest matches by sound. Most share Otto's German-origin cluster, so the rhythm and vowel shape carry across the list.
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"wealth, fortune, prosperity"
"little seal"
"gift of God, gift of Yahweh"
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"valley dweller"
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"battle worthy"
"supplanter"
"angel; messenger of God"
"from the valley town"
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"dark one, black"
Similar sound: These names share phonetic patterns with Otto — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old High German origins, giving them the same cultural heritage as Otto.
Rhythm: Otto is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.