Tadhg sits next to 4 phonetic neighbors — Teague, Tiger, and Tide are the closest matches by sound. Most share Tadhg's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"poet, philosopher"
"descendant of the dark one"
"son of Faelan (the little wolf)"
"well-born, of noble birth"
"slender, narrow"
"cloud"
"warlike, fighter (from Thracius)"
"elm tree"
"red warrior, son of the red warrior"
"brown-haired warrior"
"great, rocky hill"
"slender, narrow"
"divine, holy"
"from Arcy, Norman town"
"from the fortress"
"descendant of the champion"
Similar sound: These names share phonetic patterns with Tadhg — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Tadhg.
Rhythm: Tadhg is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.