Brendan sits next to 3 phonetic neighbors — Brandon, Brennan, and Brenden are the closest matches by sound. Most share Brendan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"prince, chieftain"
"home on the wooded hill"
"stellar explosion, burst of light"
"warrior, defender"
"genuine, authentic, honest"
"one who cares for others"
"the promised land"
"high place, elevated land"
"slender, narrow"
"watchful"
"place of hawks, kite's settlement"
"treasurer, keeper of treasure"
"powerful spearman"
"God has been gracious"
"he gave, gift"
"earthly, of the earth"
"cloud, literary, scholarly (Vietnamese)"
"great one"
"the number seven, representing luck and completeness"
"aspen tree, quaking poplar"
Similar sound: These names share phonetic patterns with Brendan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic origins, giving them the same cultural heritage as Brendan.
Rhythm: Brendan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.