Looking at names like Aldus, Aldith, Eldred and also Ethelbert and Albert, younger forms of this name could be Aldbert and Eldbert. It wouldn't be surprising if Albert and Aldbert had been confused for each other in the past, meaning that it's hard to find evidence for the above theory to be true.The Dictionary of Medieval Names from European Sources lists the name "Altbert" as a form of this names (Source: https://dmnes.org/name/Altbert). Looking at that source, I wonder if Aldebert would be another younger form of this name as well.
It wouldn't be surprising if Albert and Aldbert had been confused for each other in the past, meaning that it's hard to find evidence for the above theory to be true.
The Dictionary of Medieval Names from European Sources lists the name "Altbert" as a form of this names (Source: https://dmnes.org/name/Altbert). Looking at that source, I wonder if Aldebert would be another younger form of this name as well.