Diyan sits next to 4 phonetic neighbors — Dylan, Dayan, and Dian are the closest matches by sound. Most share Diyan's Slavic cluster, so the rhythm and vowel shape carry across the list.
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"light, brightness"
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"morning light, aurora"
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Similar sound: These names share phonetic patterns with Diyan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Slavic origins, giving them the same cultural heritage as Diyan.
Rhythm: Diyan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.