Where does “Southern Sudanese” come from?

Southern Sudanese (English) comes from English ese, from Mexican Spanish ese, from Latin ipse, from Proto-Italic *e(s)peso — himself, herself, itself.

Southern Sudanese (English): Of, from, or relating to, Southern Sudan

Definitions

Of, from, or relating to, Southern Sudan

Ancestry of “Southern Sudanese”, step by step

Southern Sudanese traces back through two separate lines of ancestry.

via English ese

Step	Language	Word	Meaning
1	English	ese	dude, man
2	Mexican Spanish	ese	The name of the Latin-script letter S; that;...
3	Latin	ipse	himself, herself, itself, the very, the actual;...
4	Proto-Italic	*e(s)peso	himself, herself, itself

via English Southern Sudan

Step	Language	Word	Meaning
1	English	Southern Sudan	South Sudan

Every word from Proto-Italic *e(s)peso →Every word from Latin ipse →Every word from Mexican Spanish ese →