Bowyn sits next to 4 phonetic neighbors — Owen, Bowen, and Rowan are the closest matches by sound. Most share Bowyn's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"son of Owen, young warrior"
"bard, sage"
"son of the pearl (via Margaret's meaning)"
"flowing river, running water"
"bright mind, shining spirit"
"pale, sallow-complexioned"
"rock, stone"
"one who works the earth"
"son of the sea, great tide"
"stony ford"
"great tide"
"the greatest one, supreme ruler"
"defender of mankind"
Similar sound: These names share phonetic patterns with Bowyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Welsh origins, giving them the same cultural heritage as Bowyn.
Rhythm: Bowyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.