How would I go about getting a random value based on percentages?

I attempted to give it a try, but so far no luck. I was wondering if I could hop on scriptinghelpers and maybe get some help. Heres my script:

lastnamepercentages = {
	{Name = "Name1", Percentage = 0.5},
	{Name = "Name2", Percentage = 0.5},
	{Name = "Name3", Percentage = 0.3},
	{Name = "Name4", Percentage = 0.3},
	{Name = "Name5", Percentage = 0.2},
}

function lastnamepercentages:RandomObject()
	local randomize = math.random();
	local pastPercentage = 0;
	for i = 1, #self do
		if randomize < self[i].Percentage + pastPercentage then
			return self[i];
		end
		pastPercentage = pastPercentage + self[i].Percentage;
	end
end

plr.PlayerAdded:Connect(function(plr)
	local randomClan = lastnamepercentages:RandomObject()
	print(randomClan)
end)