Is it possible that William was born in Harray, Orkney and registered in Reay, Caithness?

The information I have on William Sinclair (my 4th Great Grandfather) is that he was born in1766 East-on-Quay, Harray Orkney. His father's name Alex, brother Thomas and sisters Ann and Mary. He came to Canada in 1792 and died here 20 April 1818. There is a wealth of information of his time in Canada but nothing back in Scotland.

I found this William Sinclair on Scotlands People website - 18/02/1766 SINCLAIR WILLIAM father -ALEXR. SINCLAIR/ M registered in the parish REAY /CAITHNESS.


I have tried to find his siblings Thomas, Ann and Mary Sinclair but haven't been able to connect all three with a father named Alexander.

Any help would be greatly appreciated.
Laura