This is taken from the attendance list at an on-line talk presented for and by retired people, but on this occasion open to others. The attendance list only covers retirees, who I guess would be anything from 60 years old upward.
The names are likely to be closer to British than American usage, I imagine. I also imagine that the gap is closing.
Hennie; Jim; Glenn; Robin; Michael; Rod; Tom; Keith; John; Mick; Phil; Ian; David; John; Peter; Philip; Richmond; Clive; David; Derek; Bob; Pat (gender unknown); Graham; Ed; Allan; Norman; Neil; Malan; Eric; John; John; Klaus; Godfrey; David; Pat (gender unknown); Blaise; Roger; Pat (gender unknown); Pat (gender unknown); Guy
Deborah; Leticia; Ann; Christine; Deirdre; Jeanne; Audrey; Dianne; Lori; Kathleen; Daphne; Margaret; Sal; Mary-Ann; Trudi; Jane; Ann; Beverley; Willemien; Marie; Daniela; Peta; Gillan (possible typo); Pamela; Anne; Jenny; Gilly; Diana; Therina; Elaine
Malan is a surname. My guess is that Therina is a feminised version of the surname Theron, in which case the h would be silent. Theron (the surname) is pronounced Trawn in US English; in UK English it rhymes with horn but the vowel is shorter.