You can rename the object.
Press F2 or select "Rename" from the context menu.

When an object is created, its name is automatically set, and if duplicates are not allowed, a suffix of [_number] is added.
The object name should not contain spaces or special characters.
Although some objects allow you to specify double-byte characters, we recommend using only alphanumeric characters to avoid problems with character codes.

If you have a special reason to create an environment in which double-byte characters can be used, you must unify the compiler environment and the binary code used on the actual device at runtime to either UTF-8 or Shift-JIS.
You can specify the character code in the project inspector.