It is composed of 244 individually folded protein domains connected by unstructured peptide sequences.
the name is so long because you need to have every single one of those 244 protein in the name. (chemical rule thing.)
this is kinda the reason chemist think of additional names for such chemicals.
so yes it has the long name. no nobody uses it.
i try to keep it simple
titin is made up out of about 244 proteins (132 of type I and 112 of type 2).
type 1 is build up from about 16 layers of about 100 amino acids.
type 2 is build up out of about 2 layers of 7-9 strands (each consistent of 3-9 amino acids)
as an example of amino acids is Lysine. (there are a lot amino acids but most are build up the same)
the name lysine is officialy "2,6-diaminohexanoic acid"
Progammer, i just like long names for some reason, and why wouldnt i be curios why titin got such a long other name. I really hope no one got hippopotomonstrosesquipedaliophobia here tho, if you do, i am terribly sorry.