I discussed this with some people in the OSM US slack and I am pretty confident that this is not the street name. I think it acts as a guidepost to find that specific address - I have hopefully clarified this situation by adding not:name tag to the street as well as the addresses to all of the houses which have that street address (there are a lot!). Maybe next time someone sees that sign it will be clearer what is going on here.

https://www.openstreetmap.org/changeset/159921109