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In the U.S., that type of savings arrangement is most commonly referred to as a rotating savings and credit association (ROSCA). While it might not be a mainstream financial product like a 401(k) or IRA, it is a well-known informal savings method in many communities, particularly among immigrant or close-knit cultural groups.

Some other names or equivalents depending on the community include:

- Sou-sou or susu – West African/Caribbean (especially in African-American and Caribbean communities)
- Tanda – Latin American/Mexican
- Pardna or partner – Jamaican (as you mentioned)
- Hui – Chinese
- Kye – Korean
- Chit fund – Indian

These arrangements aren’t typically regulated in the U.S., and while they can function as a form of disciplined saving or informal credit, they rely heavily on trust. In the context of investment, they’re informal and don’t provide interest—just a disciplined way to save and access lump sums.