Composer firstname lastname swap

(Not specifically Android, but there's no "iRealPro General" forum)

Looking at the URLs of iRealPro songs, I noticed that for a composer whose name is exactly two words (presumably firstname and lastname), these are swapped in the URL. For example, "Duke Ellington" is stored as "Ellington%20Duke" in the URL.
Is this defined behaviour? Is it documented somewhere?

Just curious...