I go by Sandra at home and when I worked outside the home or when I did murals for people in their homes I used Alexandra.
Tim used to call me Alex when we were dating and in the early years of our marriage. But I hated it " there goes Tim and Alex" sounded like two old farts."
I love calling Tim, "Timothy Lee" his first and middle name. He has been calling me Sandra for about 3 years now at home. HE says Sandra sounds friendly and that Alexandra sounds sexy.
I guess you can tell which name he uses in bed.