It does not change.

It always stays the exact same disguised name for any and every auction, regardless as to how many auctions u enter at once, over the same day or a week/month.

Everytime I partake in a ebay auction, my disguised ebay calculated name always appears the same to me , or to any other viewer.
The only time any part of it changes, is if additional feedback has been given and the number at the end increases numerically.  

Hope it helps.  

Thanks Brett,

Appreciate it.  I tend to watch more than I bid and the last few have been all Buy It Nows (parts only)...I never thought to check my own.