Where does “ਖੱਬੂ” come from?

ਖੱਬੂ (Punjabi) comes from Punjabi ਖੱਬਾ, from Prakrit 𑀔𑀯𑁆𑀯, from Sanskrit खर्व — mutilated, crippled, injured, imperfect.

ਖੱਬੂ (Punjabi): lefty, southpaw left-handed person