Mystery solved.

From the Times:

[Reince Priebus] knows he will have to spend a bit of time explaining his name.

A few minutes after his election was official on Friday, Mr. Priebus held his first news conference. The first topic was not his vision for the Republican National Committee, but a self-introduction and pronunciation lesson.

“My name is Reince Priebus,” he said, slowly saying his given name, which rhymes with pints (like pints of his favorite beer, Wisconsin’s own Miller High Life) and his family name (PREE-bus).

“I know it’s a tough name,” Mr. Priebus said. “That’s what happens when you have a Greek and a German for a parent — you get a name like mine.