Yesterday I met a 'Tatayu ' 塔塔悠 descendant  許 家銘 who gave a lively and interesting talk at ' Taiwan-Old-Family 4th Conference'. 'Tatayu' means the headband made mixing dog fur commonly with ramie/cotton/tree bark traditionally followed by a red dye. This practice was documented as early as 1600s by Dutch missionary Georgius Candidius. Coincidentally, I have done a little bit research about the topic recently purely for interest and I am taking the opportunity to draw some conclusions. There is quite a bit of materials I have here but will in this instance bring out a few key points  - for my own records and also sharing with  許 家銘 for his interests. I. 'Tatayu/Catayo' Etymology  Today there is Shang-Tayu 上 塔悠 （literal upper Tayu)  and Xia-Tayu (lower Tayu) 下 塔悠。  A geographer and a historian both contributed their thoughts at the conference about Tatayu etymology. And both from River stream perspective - upper and lower. But there is no conclusion. I,