Theresa sits next to 3 phonetic neighbors — Teresa, Tessa, and Clarissa are the closest matches by sound. Most share Theresa's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"to harvest, reaper"
"rose and lake"
"grace, favor"
"pure (from Catherine via Caitlin)"
"wished-for child"
"good, honorable, noble"
"life"
"modern blend of Jane and Vanessa suffix"
"from the hay field"
"gate by a lake or moor"
"bringer of joy"
"love"
"praised"
"valley of the River Kent"
"beloved, wished-for child"
"rose lake, rose by the water"
"my God is a vow"
"anointed one"
"lake remnants, from the lake land"
"judged, vindicated"
"industrious ruler, work-power"
Similar sound: These names share phonetic patterns with Theresa — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Theresa.
Rhythm: Theresa is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.