Speaking for myself and my WH only, I would be concerned if my WH had a female coworker he didn't ever talk about. His female coworker who eventually became the OW was someone he eventually stopped mentioning whatsoever. He would talk about everyone BUT her, and not because I was suspicious or a jealous person by habit. I wasn't suspicious until he gave me a reason to be.And not speaking about her at all would be HUG-er. You people will find cheating anywhere.
I think it depends on the WS in question. Some probably can't keep themselves from finding ways to bring up a certain name and others will not mention anything, like my WH. I know someone else who is actively carrying on an affair and they find every reason possible to interject their AP's name into conversations .