Where does “چرایی” come from?

چرایی (Persian) comes from Persian چرا, from Persian چراغ, from Middle Persian clʾγ — lamp.

چرایی (Persian): reason

Definitions

reason

Ancestry of “چرایی”, step by step

چرایی traces back through two separate lines of ancestry.

via Persian چرا

Step	Language	Word	Meaning
1	Persian	چرا	why; yes; surely
2	Persian	چراغ	lamp; light; stove
3	Middle Persian	clʾγ	lamp

via Persian ـیی

Step	Language	Word	Meaning
1	Persian	ـیی	form of the suffix

Every word from Middle Persian clʾγ →Every word from Persian چراغ →Every word from Persian چرا →