Harold sits next to 5 phonetic neighbors — Harriet, Harlow, and Hazel are the closest matches by sound. Most share Harold's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"army ruler, army commander"
"flower, flourishing"
"famous warrior"
"victorious crown"
"dawn, early light"
"from the valley"
Similar sound: These names share phonetic patterns with Harold — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Harold.
Rhythm: Harold is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.