Jacintha /ja-cin-tha/ [3 sylls.] as a girls' name is of Italian, Greek and Spanish derivation, and the meaning of the name Jacintha is hyacinth. Jacintha is a version of Giacinta (Italian, Greek). Jacintha is also a variation of Hyacinth (Greek). Jacintha is also used as a variation of Jacinda (Spanish, Greek).