I use a wonderful app called LibraryThing to catalogue and manaage my 3,752 books. Among many bells & whistles, it tells me how many books I have by each writer.
Top 20 International
I’ve listed international writers’ birth country in parentheses, although several became writers in other countries and held different citizenship (for example, Salman Rusdhie became an English citizen in 1964, then a US citizen in 2016).
1. Terry Pratchett* (England) 18
=2. Julian Barnes (England) 16
=2. Cormac McCarthy* (USA) 16
=4. E.L. Doctorow* (USA) 13
=4. Roald Dahl* (England) 13
6. Alan Garner (England) 11
=7. Anne Tyler (USA) 10
=7. Ray Bradbury* (USA) 10
=7. Douglas Adams* (England) 10
=10. Ian McEwan (England) 9
=10. Philip K. Dick* (USA) 9
=10. Alan Bennett (England) 9
=10. Salman Rushdie (India) 9
=14. Margaret Atwood (Canada) 8
=14. Angela Carter8 (England) 8
=14. Kate DiCamillo (USA) 8
=14. Roddy Doyle (Ireland) 8
=14. Michael Frayn (England) 8
=14. E. Nesbit* (England) 8
=14. David Sedaris (USA) 8
=14. John Steinbeck* (USA) 8
Top 20 Australian
Several Australian writers were born overseas but lived and did all or most of their writing in Australia. Conversely, some did at least some of their writing overseas but still identified as Australian.
1. Ruth Park* 13
2. Jeff Apter 12
=3. Thomas Keneally 11
=3. Patricia Wrightson* 11
=3. Peter Carey 11
=6. Tim Winton 10
=6. David Malouf* 10
=8. Morris Lurie* 9
=8. Kylie Tennant* 9
=8. Carmel Bird 9
=11. Anita Bell 8
=11. Helen Garner 8
=11. David Ireland* 8
=11. Clive James* 8
=11. Elizabeth Jolley* 8
=16. Stuart Coupe 7
=16. Eleanor Dark* 7
=16. Kate Grenville 7
=16. Susan Johnson 7
=16. Christina Stead* 7
=16. Patrick White* 7
* indicates deceased