Tessah sits next to 3 phonetic neighbors — Tessa, Teresa, and Tess are the closest matches by sound. Most share Tessah's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"summer; from Therasia island"
"fair-haired"
"clear, bright, famous"
"gentle, beautiful"
"the land of the Indus River"
Similar sound: These names share phonetic patterns with Tessah — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Tessah.
Rhythm: Tessah is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.