A domain named 'Object' cannot be assigned to a field and cannot be deleted, why?

Question

I created a new domain called 'Object'. I tried to assign it to a field. It did not work: it simply would not appear in the domain field of the field properties dialog after I clicked it. I then tried to delete this domain. This also did not work. I created a new domain called 'Obj' and this performed correctly. Please advise. Possibly, ArcCatalog/Map/etc should inform users automatically when they try to name a domain 'Object' that it will not work. Please advise me if it will ever be possible to delete this domain or if I will have to recreate the whole file geodatabase. Version: ArcGIS Desktop 10.5.1.

GISMallku · Answer

I also tried in ArcGIS Pro 2.3 and can add a domain called Object to a file gdb and apply the domain to a field.

When I try to delete the domain before removing it from the field first, I get this error:

Ahhh, that is a good error message.  So I'll remove it from use first, then see if I can delete it.

That worked!

Asrujit_SenGupta · Answer

I just tested it on a newly created File geodatabase and worked fine for me. I can create a domain named "Object", assign it to a field and later delete it too. I was using Desktop 10.4.x.

So it is not an Esri limitation or restriction..

JoeBorgione · Answer

Sorry, just couldn't help myself....