Willian sits next to 3 phonetic neighbors — William, Wilson, and Guillermo are the closest matches by sound. Most share Willian's Portuguese-origin cluster, so the rhythm and vowel shape carry across the list.
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"resolute protector"
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"God will strengthen, strengthened by God"
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"dark-complexioned"
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"sixth"
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Similar sound: These names share phonetic patterns with Willian — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Willian.
Rhythm: Willian is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.