Do tower-controlled helipads have a standard naming convention? Just wondering if anyone knows, or if it just depends on the airport.

Edit: This question is different than How does the FAA determine which format of location identifier to assign to an airport?.

My question is how the tower names helipads under its control at an airport, not how the FAA assigns an identifier to an airport as a whole. Runways use the runway heading. How are helipads named?
Normally helipads are allocated names depending on what taxiways they are adjacent to. For example, Helipad Alpha would be off or near taxiway Alpha. Helipad Charlie would be off of Taxiway Charlie. Results may differ depending on the airport/heliport layout, but this is how the normal naming system works.