Al-Matalib al-'Aliyah 3661 — Surah Ta Ha

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) concerning the saying of Allah Almighty: "Ta Ha" [Surah Ta Ha: 1], that he said in explaining it: "It means 'ya rajul' (O man!), and this word is from the Nabataean language."
Al-Harith narrated it in his Musnad. In its chain, Sharik bin Abdullah al-Qadi is open to question because of the weakness of his memory; however, this meaning is supported on the basis of other corroborating reports.