首楞嚴義疏注經 3.424

3.424

舉事也。剎帝利，云田王。婆羅門，云淨志。毘舍，云坐估。首陀，云農者。頗羅墮，云利根，亦捷疾。旃陀羅，云殺者。

This adduces the instance. Kṣatriya means 'field owner'. Brāhmaṇa means 'pure will'. Vaiśya means 'merchant'. Śūdra means 'farmer'. Bharadvāja means 'sharp faculty', and also 'swift'. Caṇḍāla means 'slaughterer'.