Claiming a lineage back to impressive forbears is a pretty common thing - didn't the Roman's claim ancestry back to Troy, even the Scots claimed ancestry back to the Scythians...
https://theconversation.com/glastonbury-archaeology-is-revea...
Meanwhile here in Scotland we've just got a rock that someone used as a pillow - but we do have a cool footprint and a nice island with "its cargo of mouldering kings".
That is a pretty impressive lineage, no matter who you are. I know why people see a direct line to this or that ancient tyrant as special, but it is a ridiculously fine distinction, comparatively.
Cryptonomicon
Edit: I was going to say that the name of the book isn't referencing that kind of crypto, but then I remembered that it actually is!