its posible

[pepsi18]

is possible ban a player with a particular account

when it login

[toxicsmoke11]

function testOne() 
local playerAccount = getPlayerAccount(source) 
if playerAccount == "test" then 
banPlayer(source) 
end 
end 
addEventHandler("onPlayerLogin",root,testOne) 

not tested,add this resource to admin acl group to work

and change test to your account name which u want banned

[-.Paradox.-]

Use getAccount name, and check if the player's account name is "textname" and then ban him/her.

[Max+]

  
addEventHandler ( 'onPlayerLogin', getRootElement ( ), 
function () 
if (getPlayerAccount(getAccountName(source) == 'Name Here' )) then 
banPlayer ( source, false, false, true, getRootElement ( ), 'reason ban' ) 
   end 
  end 
  ) 

learn from it ,

[RenanPG]

Try this:

Use server-side

function ban() 
  
    local accname = getAccountName(source) 
    if ( accname == "Name Here" ) then 
        banPlayer(source) 
    end 
     
end 
addEventHandler("onPlayerLogin", root, ban) 

[TAPL]

AccBans = { 
    ["Account Name Here"] = true, 
    ["Account Name Here"] = true, 
    ["Account Name Here"] = true 
} 
  
addEventHandler("onPlayerLogin", root, 
function(_, account) 
    local accountName = getAccountName(account) 
    if AccBans[accountName] then 
        banPlayer(source) 
    end 
end) 

[.:HyPeX:.]

banPlayer lets you ban by username thougt. just re-read the function.