A tailor or seamstress is 裁縫師, pronounced さいほうし (saihōshi). In universe, Raen names don't do long vowels, so it would be just Saihoshi. I don't really know if it's an old enough term to be used as an Auri name though; maybe someone else can give you a better idea of how old or modern this term is. But if all you need is "close enough", I don't think your average player will question you if you name an Au Ra character this.