Thierry sits next to 3 phonetic neighbors — Theodore, Terry, and Tiernan are the closest matches by sound. Most share Thierry's French-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"ruler of the people"
"lord of the manor, estate ruler"
"yew warrior"
"fen dweller, marsh wolf"
"claw of a bird of prey"
"wise protector"
"to be filled with wonder and admiration"
"Titaness, mother of Apollo and Artemis"
"triangular wall end, architectural peak"
"prosperous ruler"
"of noble lineage"
"street"
"wooded dune area, hare meadow"
"drawn from the water"
"archer; one who works with yew wood"
"healer"
"noble home"
"battle camp"
"shield-wolf"
Similar sound: These names share phonetic patterns with Thierry — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Thierry.
Rhythm: Thierry is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.