Y is correct. The signs on the road say say, and the NYDOT says so. However, what is wrong is that they do not use the traditional apostrophe. It should be Willy ONeil.

https://www.dot.ny.gov/divisions/engineering/technical-services/hds-respository/NYSDOT_2022_LHI_Local_Roads_and_Streets_Otsego_County.pdf

I'll fix it.