words of one syllable, in

In simple terms, as in I don't understand financial derivatives-can you explain them in words of one syllable? [Colloquial; 1920s]

Name	Pronounced	Usage
Mathys	-	French
Nicolette	-	French
Bamidele	-	Western African, Yoruba
Josslyn	JAWS-lin	English (Rare)
Hisein	-	Arabic
Helmi	HEL-mee (Finnish)	Finnish, Swedish