[Facts] TAM
Tam as a Scottish name is simply the northern-British Isles pronounciation of "Tom," the nickname of Thomas. An uncle who served in the 1st Armored Division in 1942 before shipping to North Africa told his Scotch-Irish Indiana family members that Tam is a common family name in both Glasgow and Belfast, Northern Island.
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And it means 'perfect' in Hebrew. :)
It's also a type of hat. :P Just chiming in. A scottish beret of sorts.
Three letters - what do you expect?!