Niam sits next to 3 phonetic neighbors — Niamh, Liam, and Neem are the closest matches by sound. Most share Niam's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"bright, radiant"
"hollow land (alternative)"
"slender, narrow"
"modern invented name"
"modest, shy"
"He has given (divine gift)"
"short form of Kipling or Christopher"
"gift of God, God is salvation"
"modern invented name"
"nobleman of the second rank"
"to light up, illuminate"
"Gomeric's hill"
"resolute protector"
"little Aodh (fire deity)"
"son of Carr, marshy land"
"green river, fresh water"
"messenger of God"
"winding river"
"from the coal settlement"
"valley dweller, from the valley"
"Macks settlement"
Similar sound: These names share phonetic patterns with Niam — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Niam.
Rhythm: Niam is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.