Holdyn sits next to 3 phonetic neighbors — Holden, Holton, and Colton are the closest matches by sound. Most share Holdyn's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"deep valley dweller"
"running (speed)"
"the sky, abode of God"
"invented: jay bird + fair (vin)"
"from the rocky settlement"
"place of glamour and royalty (associative)"
"God has given"
"helpful, from Cody's Irish root"
"venerable, worthy of reverence"
"experienced in rule"
"one who wields prosperity"
"who is like God? (rhetorical, meaning no one)"
"ox (original pictographic meaning)"
"dark, black"
"descendant of Bladen"
"of the sea, the pool"
"slender warrior (Celtic phonetic elements)"
"handsome, comely, gentle"
"servant, messenger"
"first light"
"gift from God"
Similar sound: These names share phonetic patterns with Holdyn — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Holdyn.
Rhythm: Holdyn is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.