What is the suffix for regal?

There isn't a specific suffix for "regal." "Regal" itself is an adjective meaning "royal" or "fit for a king."

If you're looking for words related to "regal," you could consider words like:

* Regally (adverb): in a regal manner

* Regality (noun): the state of being regal

* Regent (noun): a person who rules a country during the absence of a king or queen

* Regime (noun): a system or method of government

Let me know if you have any other questions!