Sakiya in Pali and Sakya in Sanskrit. The tribe to which Shakyamuni belonged.

(Sanskrit) or Sakya (Pāli) is the name (derived from Sanskrit śakya, "capable, able") of an Indo-Aryan-speaking nation or janapada of the (the so-called "warrior caste"). The Śākyas formed independent tribes or kingdoms near the foothills of the Himālayas. The Śākya capital was Kapilavastu (Pāli: Kapilavatthu).

an ascetic of the Buddhist clan

Name of Siddhartha's clan