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"
"crew, group of companions"
"lawful, true to one's pledges"
"one who lives near the fens or marshes"
"treasurer, keeper of treasure"
"love, passion transformed"
"narrow, a strait"
"dark blue water"
"high guardian, high watchman"
"his excellence, his preeminence"
"one who helps"
"swiftness, fleetness"
"from the Roman family Terentius"
"pilgrim, palm branch bearer"
"God has given"
"ruler, sovereign"
"born of fire"
"near the holly trees"
"resolute protector"
"the brown one"
"son of the brown-haired one"
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.