What words or phrases would you use to introduce someone by a nickname they've chosen? Say I want to introduce Dr. Samuels (who introduces herself as Susie-Q) to Dr. Smith. I can't call my superior Susie-Q without mentioning that the nickname wasn't my idea. Is there a word for someone's chosen form of address?
Just add the nickname at the end, after a pause, generously garnished with a smile. If you are close/ informal enough, you could add "to us all" as well.
"Mr. Abraham Lincoln, :-) Abe (to us all)"
When introducing oneself, "to you" is the familiar way to go.
You could use a pause as a verbal colon
This is Dr. Samuels [pause] Suzie-Q.
Personal introductions are usually conducted with glances and gestures toward the person being introduced, further clarifying that the name and nickname are both attibuted to that individual.
Note: The gist of this answer was earlier offered by @Kris, (which I overlooked). Please see that answer.