When Gylfi tries to trick the gods into entering Asgard under a false identity, he adopts the name Gangleri.
Later, during his discussion with Hár, Jafnhár, and Þriðji, it is revealed to him in stanza 20 the list of names by which Odin is known (I cite here the norse version):
Grímnir, Glapsviðr, Fjölsviðr,
Alföðr, Atríðr, Farmatýr,
Jalkr, Kjalarr, Viðurr,
Þrór, Yggr, Þundr,
Not only does the list contains the name of his interlocutors (which was expected) but the pseudonym he chose is also contained in the list, hence my question: what does it mean? Did Gylfi chose the name knowingly? Is it a way for Odin to tell him that he is aware of the trickery? Or just a random etymological coincidence?