You can assign a name to any subaddress book.
1.
Press

→ [Set Destination] → [Rename Address List].
2.
Select a subaddress book to name → press [Rename].
3.
Enter a name → press [OK].
NOTE
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If you press [OK] without entering any characters, the subaddress book name reverts to its current name (default Address List 1 to 10).
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4.
Press [OK].