Taran sits next to 4 phonetic neighbors — Taryn, Darian, and Aaron are the closest matches by sound. Most share Taran's Welsh cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"thunder"
"circular stone fortress"
"fort, castle"
"spirit of battle"
"thin, lean"
"Ireland, land of the west"
"holy one (of Dewi/David)"
"ancient, enduring, long-standing"
"first of the month, calends"
"descendant of Braonán (moisture/sorrow)"
"keen ruler, bold king"
"descendant of the gentle one"
"red-haired, famous"
"from Grantham"
"descendant of the dark-eyed one"
"abbot, religious father"
"beloved, darling"
"mountain of strength, exalted"
"son of the dark one (via Maurus)"
Similar sound: These names share phonetic patterns with Taran — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Proto-Celtic origins, giving them the same cultural heritage as Taran.
Rhythm: Taran is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.