Harmon sits next to 4 phonetic neighbors — Herman, Harmon, and Hamlin are the closest matches by sound. Most share Harmon's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"army protector"
"little warrior"
"village of the Danes"
"of God, divine man"
"street"
"poet, philosopher, wise man"
"desired, longed for"
"son of Jack"
"supplanter, one who takes another's place"
"military rank above captain"
"belonging to God"
"sky-inspired modern coinage"
"oak, fertile, fruitful"
"power of the people"
"servant of God"
"man, free man"
"of Devon, creative modern coinage"
"God is gracious"
"the color red"
"beloved"
Similar sound: These names share phonetic patterns with Harmon — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Harmon.
Rhythm: Harmon is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.