By default, Samsung calls the SIM cards "SIM 1" and "SIM 2", but in the SIM card management, the name of the SIM card can be renamed as desired.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Connections
Step 3:  Tap on  SIM card manager
Step 4:  Tap on  SIM 1 / SIM 2
Step 5:  Tap on  Name
Step 6:  Change the  Name  and confirm with  OK
  1. Open the Settings
  2. Tap on Connections
  3. Tap on SIM card manager
  4. Tap on SIM 1/SIM 2
  5. Tap on Name
  6. Change the Name and confirm with OK

Samsung Instructions
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