As I have said before but nobody listens to me, The Picts (Native Britons)were Matralineal while the Scots (Irish immigrants to Pictland) were Patralineal so look as hard on your Mother's side as your Dads'. It is traditional.

Start with a simple ancestor chart and start to fill in the blanks. You will be lucky to get back very far by asking Grand-Dad but the farther you get the better. Next ask the oldest relitives that you can, fill in that chart, cousins, aunts as much as you can. From this point research the oldest names in each branch, when and where were they born, look up those records that will get you that person's parent's names. Now when you are stumped then start the internet searches If you are lucky you will find that some Aunt or Cousin has don all of the work for you. Then you connect your tree to their's and you get a free ride back several generations.

What you want is a Scottish name like MacX, this is your link. If you are just looking for a tartan, that is as far as you need go.

Leatham looks English and Jeppsen might be Danish, so keep going farther back.