I don't know where "Martha" came from.
Martha White self-rising flour. A favorite down in DIXIE.
MARTHA WHITE THEME SONG - Flatt and Scruggs
Now you bake right (uh-huh) with Martha White (yes, ma'am)
Goodness gracious, good and light, Martha White.
For the finest biscuits, cakes and pies,
Get Martha White self-rising flour
The one all purpose flour,
Martha White self-rising flour's
Got Hot Rise.
For the finest cornbread you can bake,
Get Martha White self-rising meal
The one all purpose meal
Martha White self-rising meal
For goodness' sake