Monroe sits next to 4 phonetic neighbors — Munroe, Marlowe, and Roe are the closest matches by sound. Most share Monroe's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"mouth of the River Roe"
"shelter, protection"
"army host, expedition"
"farmer, earth-worker"
"heavenly, from the sky"
"descendant of Fionnlaoich (fair hero)"
"the winter season"
"sea battle, sea fighter"
"full of love"
"glorious sky, exalted heaven"
"my God is an oath"
"of royal status, kingly lineage"
"the Lord is my God"
"Ceol's island, ship island"
"belief, trust in God"
"descendant of Riagan"
"halo of light around the moon"
"laurel, victory crown"
"of Mars, warlike"
"peaceful, complete"
"delight"
Similar sound: These names share phonetic patterns with Monroe — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Gaelic/Scottish origins, giving them the same cultural heritage as Monroe.
Rhythm: Monroe is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.