Harold sits next to 3 phonetic neighbors — Gerald, Garold, and Harlow 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, power of the army"
"little warrior, young Mars"
"son of the army ruler"
"from Dayton"
"the brown one"
"prestige, luxury (cultural association)"
"new house"
"oak grove, great"
"from the place Brodie in Moray, Scotland"
"fine, elegant"
"of Nîmes, sturdy woven cloth"
"high stronghold, fort on the headland"
"God knows"
"high place, elevated land"
"long stone settlement"
"protector of people"
"from the Rodney estate"
"courteous, well-bred"
"rock, harmony"
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.