Welcome, also, Grace.

"Double-barrelled" names? No, never heard of 'em, but it's a great term and should be used as often as possible.

Do you also refer to hyphenated words as being double-barrelled? Rootin'-tootin' in rootin'-tootin' cowboy seems a natural candidate for a double-barrelled word. I don't know that it's hyphenated, but.