Jacaerys sits next to 4 phonetic neighbors — Viserys, Zacarias, and Jace are the closest matches by sound. Most share Jacaerys's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"royal dynastic heir (constructed language)"
"from Brittany, land of the Britons"
"symbol of wisdom and knowledge"
"pledge, oath, measure"
"one who bakes bread"
"son of Walter, ruler of the army"
"roe deer wood"
"strength, authority, force"
"royal power"
"blessed"
"noble, honorable"
"brother, friend"
"court officer, legal summoner"
"sharp, intelligent"
"fair, upright"
"supplanter, held by the heel"
"noble friend"
"strong-willed warrior"
"flower"
Similar sound: These names share phonetic patterns with Jacaerys — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have High Valyrian (fictional) origins, giving them the same cultural heritage as Jacaerys.
Rhythm: Jacaerys is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.