Macsen sits next to 5 phonetic neighbors — Maxen, Mason, and Maxon are the closest matches by sound. Most share Macsen's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"supreme, excellent"
"lover of churches"
"red-haired, famous"
"short form of Bogoris (divine gift)"
"fort, castle"
"sad"
"holy one (of Dewi/David)"
"keen ruler, bold king"
"Irish Gaelic form of John"
"mighty hound, great wolf"
"graceful warrior"
"champion, noble one"
"beautiful; fair"
"beloved, darling"
"God is gracious"
"chief, royal descendant"
"Winda's homestead, windy village"
Similar sound: These names share phonetic patterns with Macsen — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Macsen.
Rhythm: Macsen is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.