Difficulty of Matriculating Arms?

[Jack Daw]

I am an armiger, bearing arms granted by Lord Lyon. I inherited them upon the death of my father. He matriculated his arms from those granted to his forebearer...We petitioned Lord Lyon for a grant of arms to my g-g-g grandfather, Donald McLean, who was born in Scotland...My father then petitioned for a matriculation of those arms in his own name, as a male descendant of Donald...You must, if you are petitioning in memory of an anscestor, have the same surname as that person.

Regards,
Sandford

All your information is spot on with the LL's webby that I had read previously. Unfortunately, I was unaware that my last name had to match for whom I'm petitioning. I was going to petition for one of my Scottish great-grandfathers, but we do not share the same last name. I will need to work further on my surname genealogy a bit more before I can start that process, I suppose. Ho-hum. Thanks for sparing me wasted effort.