Is there any way to sync wifi between devices? Are there any apps or methods to sync saved wifi between Android devices? Basically it would remember the wifi name and password if you logged into it once from one device on all devices synced.
Wifi credentials are actually not stored very securely at all, (plain text!), but in a system folder, meaning that only a rooted app could access it. Google's backup is your best bet.

It's stored in the data/misc/wifi/wpa_supplicant.conf file, for the record.

If your phone is rooted, there are apps like Wifi Key Recovery  and Wifi Password Recovery that can get you the keys, but I know of no apps that will automatically sync these as well.