Salome's list "Four Syllables - Girls" of 2 great name ideas: Elodia - Thomasina!

Four Syllables - Girls

As Elodie filters into the mainstream, parents may turn to the rarer Spanish form Elodia as an alternative.

Elodia

Though rarely used now that many parents would rather appropriate men's names than sweeten them with feminine endings, Thomasina does have some vintage appeal. 
 Thomasina Coverly plays a large part in the Tom Stoppard play Arcadia. And Thomasina also has some critter cred--Thomasina Tittlemouse is a Beatirx Potter character, there's a Disney movie called The Three lives of Thomasina, about an enchanted cat, and a Paul Gallico novel titled Thomasina, the Cat Who Thought She was God.
 Another version is Thomasin, newly visible via the 2016 horror movie The Witch and also used for a major character in Thomas Hardy's novel The Return of the Native. Hardy's heroine is commonly called Tamsin, the more popular short form.
 Breathing some fresh life into the name is the trend toward boyish nicknames. Tommie makes a cute choice, less expected than Charlie or Frankie.