AUA1989; Aruba airport code, year of first visit.
When the kids were growing and first getting onto the the internet I remember when there was such a push to not put personal information out there. I was always preaching to my kids, no name, no address, no phone, no school, no hobby, no personal descriptions, no vacation info, no pics with identifying info. Anyone remember those days? So, I got into that habit as well, and on most sites I don't use my name.
However, that seems so old fashioned now. Everywhere we look, FB, instagram, email has personal data. And, if we don't publish it ourselves, someone else will.