I haven't seen the word 'Googolplex' mentioned for a while.
It's probably the highest number with a 'common name' since it's a relatively useless value. That is, I've never heard of any really
practical use for the number. I could be wrong but I think that even the number of electrons in the 'known universe' doesn't come close to the value of a 'googolplex'.
(Right before I posted this, I remembered wondering if there were any estimates anywhere concerning the total number of all CPU cycles that occur daily on all the computers running everywhere in the world. I really don't want to strain my brain about it, but it could be that we may someday reach the point where the world's computers are operating on a 'googol-hertz' basis. Maybe the 'procrastinators' would like to take a look at that possibility. However, I think we're still awfully far away from anything in the 'googolplex-hertz' realm.)
...Returning to numbers and names: even without involving 'scientific notation' it's fairly easy job to construct a higher number value than a googolplex - no doubt just as useless a value as a googleplex too.
The simplest example of a higher (non 'common name') value would be a 'Googolplex plus one'.
So, if you were so inclined, you yourself could easily assign whatever name you liked to a number such as 'a googolplex to the googolplexth (power)'.
I dunno... name it a 'golgoogolplex'...
Then you'd just have to wait for the term you've invented for this somewhat absurd number to come into 'common' usage.
However, you may have to wait a few googol years to be recognized for your effort.
fred