Rais : 1: Muslim: from a personal name based on Arabic raʿīs ‘leader’ also found in combinations such as Raʿīs ud-Dīn ‘leader of religion’.2: German and Swiss German: from the personal name Ragiso a pet form of any of the ancient Germanic compound names beginning with the element rag- a short form of ragin ‘counsel’.3: German and Czech: from an altered short form of the Biblical personal name Zacharias.4: Czech: from German Reis.
Source : DAFN2 : Dictionary of American Family Names 2nd edition, ©2022 by Patrick Hanks and Oxford University Press
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