My 3xgr-grandfather is Alexander Davidson. He married Jean Ross on 2 July 1806 in Laggan, Inverness-shire. Their several children were baptized in Lockerrack (sp?). I am looking for help finding a record of his birth. Don't know if he was born in that area. I have searched ScotlandsPeople, and found that was rather expensive without any definite data to go by. Any help or direction would be appreciated.
I don't know where you came across Lockerrack, but I think you can be fairly certain that there is no place of that name. There is a Loch Ericht, and it is possible that Lockerrack is a misspelling or misreading of that, although Loch Ericht is not in the parish of Laggan. (There is also a Loch Errochty, but it is in a different parish in a different county, and in any case did not exist in 1806 because it was only created by building a dam in the 20th century.)
Or Locherrack could be somewhere around the Corrieyairack Pass. The old map at
http://maps.nls.uk/geo/explore/#zoom=15&lat=57.04462&lon=-4.57104&layers=B000000000F shows Leachdan Chorrach, which I suppose could have been misheard by a non-Gaelic-speaker and written down as Lockerrack.
You can read about Laggan and other parishes at
http://stat-acc-scot.edina.ac.uk/sas/sas.asp?action=public&passback=I see from
http://www.freecen.org.uk/cgi/search.pl that there is a Jane Davidson, age given as 65, in Insh, parish of Kingussie and Insh, in the household of Alexander and Janet McPherson. This looks like the family of Alexander MacPherson and Janet Davidson: Janet, 1831; Jane, 1833; Malcolm, 1836; Ann, 1838. (Isabel, born 1828, is not with her family. She may have died young.) So it looks as if the widowed Jean/Jane is living with her daughter and son-in-law.
In which case I think you will struggle to find a death record for Alexander, which will make it almost impossible to be sure who his parents were, unless the children's baptisms give any clues. Do they record the witnesses' names, and if so do they look like family members? Where did they reside?
You said that you have Jean/Jane's death certificate. Who were her parents? How old does the certificate say she was?