Hi Penny,

The etymology was just about Tyr probably being the leader of the gods in the past. The reasons for considering him the right man for the job are that he is the god of single-handed combat, which is somewhat confusing but here means that only two people are fighting. Thus, he is the gods of the bravest, the champions, the leaders, judgement. He is not as strong as Thor, but stronger than any other (except for Thor's strength personified as his son.) He may not be as wise as Odin, though even that's not explicit, but is certainly held to be wiser than any of the others. He seems the only god willing to make a personal sacrifice for the good of all, by putting his hand between Fenrir's teeth, and in fact makes that sacrifice. I don't think there's a single story about Tyr, but from the stories about other gods, Tyr seems the worthiest of all.

Indeed, Zeus is the one hurling lightning bolts. He also was the god of the dead, until Hades (personified?) was introduced into the pantheon. So was Odin in one of his aspects. Such specifics on their own may not be enough to prove they have the same function. On the other hand, I'm not so sure that the translations from one pantheon to the other are all that trustworthy. They seem to stem from a time when the cultures met again, rather then from before the split of the cultures long before that. Thus, they connect gods that at that time have some common characteristic. This then combines Ares, god of Battle, with Mars, god of Agriculture, and with Tyr, god of Justice. Or Hermes, god of Cattle, with Mercury, god of Cereals, with Odin, god of Gods.

Nuada lost his original hand in battle. Because of his one-handedness he was dethroned. After his missing hand was replaced with a silver hand, he was acceptable to his people again (and for some reason he didn't tell them to go tell that to the Formoire).
He was eventually killed by Balor's evil eye. In some stories that seems to be Balor's only eye, in other it's an additional one, in the back of his head. Either way, that would mean he only had one eye in his forehead.

Bye
                                                                Mysha