Who decided you have to be dead to have something named after you, and what basis did they have for deciding that?
Googling "five years after death geographic feature" gives me a United States Geological Survey Source https://www.usgs.gov/us-board-on-geographic-names/how-do-i
If a monument could be named a day or a month after someone's death, that may create a Perverse Incentive for "early deaths" for brownie points...