How do I get the Name of a filled region?

check out this:

A simplified code to your request:

import clr
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *

clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)

clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager

doc = DocumentManager.Instance.CurrentDBDocument
 

fRegions = FilteredElementCollector(doc).OfClass(FilledRegionType).ToElements()
TransactionManager.Instance.EnsureInTransaction(doc)
for f in fRegions:
	if Element.Name.__get__(f) == "Vertical":
		f.Name = "Horizontal"
TransactionManager.Instance.TransactionTaskDone()
OUT = fRegions
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