Answer
1. No one can keep Qadhaa fast on behalf of another. If it is truly difficult for the person to keep Qadhaa, then he/she should pay Fidyah for all outstanding fasts.
2. Khuzaymah is the name of a number of famous Sahaabas (Radhiallaahu Anhum). We were unable to locate its literal meaning.
and Allah Ta’ala Knows Best
Moulana Imraan Vawda
FATWA DEPT.