only refs I have (manxnotebook) are directories :
1894 Hirschfeld Mrs Sarah, 2 Albert-terrace [douglas]
1887 Hirschfield, P. C at same address -
1882 Herschfeld, Philip Charles (retired)
1863 Herschfeld P. C., teacher of German, Albert terrace

no later directories - during WW1 many with German names changed them to be more english.