co-creditor; joint obligee
Legal term for a person who shares a claim or right with others, typically in a contractual or financial context.
As a co-creditor, he can also claim a portion of that credit.
共同債務者 is a co-debtor or joint obligor, the counterpart to a co-creditor.
Compound of 共同 (joint, common) + 権利者 (right holder, obligee).