I met BL_ID 189999, and his name was Blockhead190000, i don't know if it was a joke or not.
btw 6k masterrace ;)
This is what happens.
Someone buys Blockland and gets BL ID 1999.
They change their name to Blockhead2000.
Someone else buys Blockland and gets BL ID 2000.
The system can't give them the name Blockhead2000 because it's already taken.
The system makes up for it by giving them the next available name up.
Everyone now has the name BlockheadBL_ID+1 until someone buys Blockland and changes their name before anyone else buys the game.