Where does “حُسَيْن” come from?

حُسَيْن (Arabic) comes from Arabic س, from Arabic سَوْفَ — {{qualifier|future tense marker}}.

Ancestry of “حُسَيْن”, step by step

Step	Language	Word	Meaning
1	Arabic	س	will
2	Arabic	سَوْفَ	{{qualifier\|future tense marker}}