[Merem]

"Sie" and first name was used at a smallish company (~50 employees) I worked at previously. It's just a combination of respect and familiarity. Additionally, several women really liked being called by their first name as it "made them feel less old".

[xnyan]

This was common in the United States Southeast as a kid and still is to a lesser degree e.g. ”Miss Anne, please can I go outside?”