Dom sits next to 3 phonetic neighbors — Tom, Ron, and Don are the closest matches by sound. Most share Dom's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"belonging to the Lord"
"beautiful mountain"
"son of the dark one (via Maurus)"
"son of Tenney"
"sky, heaven"
"little Hugh, small-hearted one"
"son of Guy"
"noble bear"
"hill, eminence (via Brian)"
"mountain of strength, exalted"
"God is my salvation"
"lucky, fortunate"
"fighter, battle"
"son of Ken, son of the bold"
"the color blue, sky"
"safe haven, shelter, refuge"
"divine water (Zoroastrian)"
"the unseen"
"anointed one"
"foot soldier"
Similar sound: These names share phonetic patterns with Dom — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Dom.
Rhythm: Dom is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.