The most eminent after the Angelic Doctor himself of course, are: Thomas de Vio Cajetan (commentator of the Summa Theologica), Dominic Bañez, John of St. Thomas, Francesco Silvestri (commentator of the Summa Contra Gentiles), Dominic of Soto, the Salamanticenses (mostly the Discalced Carmelites) , Francisco Suárez (though not strictly a Thomist), Antoine Goudin, Cardinal Billuart, Cardinal Zigliara, Joseph Gredt, Edouard Hugon, Santiago Ramírez, Royo Marín and Guérard des Laurieres.
Some of these may be more obscure than others, but all are worthy of being named and referenced in any good manual of Catholic theology or philosophy.