Baldur sits next to 3 phonetic neighbors — Balder, Baldur, and Baldr are the closest matches by sound. Most share Baldur's Scandinavian cluster, so the rhythm and vowel shape carry across the list.
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"prince"
"clear, luminous"
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"compassion of God"
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Similar sound: These names share phonetic patterns with Baldur — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Baldur.
Rhythm: Baldur is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.