It's interesting to see how nobody seems to agree on which eye he is supposed to have sacrificed. A very interesting folkloric tidbit regarding this, is that in many places in Scandinavia Odin is seen as the crop spirit (or as a precursor to the crop spirit, or the crop spirit is seen as Odin, or etc...) to whom the last sheaf is sacrificed (sometimes at yule [1] - since Odin, as Jolne or Jolner, is the lord of yule - sometimes it's left on the field for him, and sometimes the sheaf is said to be for his horse Sleipner, and sometimes... well, you get the picture, tradition vary), and whose characteristics some places - and in Västernorrland in Sweden in particular - seem to have been mixed up or merged with that of the house- or farm spirit [link], giving the latter only one eye that is placed in the middle of his forehead.
Some years ago (2009), a survey was made to find the number of Norwegians above the age of 15 who made offerings to the farm spirit during yule, a custom that is believed to be well over 1000 years old, and it showed that over 400 000 individuals do (of a total population that at the time of the survey had not yet reached 5 millions). 350 000 do it every yule, and 75 000 do it every other yule - I will assume these latter are divorsed parents who have the children over only every other yule.
The farm- or house (or barn or stable) spirit has also merged with the more modern Christian Father Christmas or Santa Claus figure, so it is also he who brings gifts to most Norwegian children on yule eve. However, some places it is the yule goat who does this. The yule goat is related to the customs with the last sheaf, which often was made into a billy goat (you probably know the kind: [link]), a character that features in our mumming traditions, or some other straw figure or -toy as a representation of or offering to the yule goat (I never really understood which, since a goat and a billy goat have different names in Norwegian, so maybe it's both...?), and is therefore related to the customs and beliefs surrounding the crop spirit, which is related to the figure of Jolne, who is Odin...
And, I'm back where I started, with the one-eyed-god.
You know, the guy that looks like a female at the Ascot races... uhm... what's-his-name...
In Scandinavian folk tradition Odin can be called by different names depending on the situation in which he is talked about or encountered. He is also known by different names in different regions. He is rarely spoken about by the name Snorri Sturlasson and the 19th century national romantics have made popular, and he is also understood quite a bit differently from the character that some old-timers call "Odin from the books".
Some of Odin's names in folk tradition
Asagrim - masked god
AsagrĂĄ - grey god
Goi or Go'en - South Swed. and Dan. dial. the good one
Noa and Noak - the same as the Biblical Noah as it is spelled in the Scandinavian languages - however, it is actually derived from the name Odin (Norw./Dan.)/Oden (Swed.), see below how come
Noen - Norw. and Swed. dial. somebody, variant NĂĄen/NĂĄ'n (see below), but it actually derives from han Odin/Oden = lit. he Odin (You can't find them in our written languages, but the majority of Scandinavian dialects use something I have been taught are called preproprial articles in front of nouns (in certain cases) and personal names (almost always), and often - as in this case - they are homonymous with the weak forms of personal pronouns. Examples on this pdf: [link] show what it can look like).
NĂĄen and NĂĄ'n - the dead one or the corpse, see above
Ode ("oo-duh") - South Swed. and Dan. dial., derived from Odin/Oden
Oen - South Swed. and Dan. dial. derived from Odin/Oden
Oske - the chosen one or the wished for. Interesting tidbit unrelated to Odin, but related to the word oske: adopted children used to be called oskeborn - literally children who are chosen or wished for.
How to invoke him for an exchange of services according to folk tradition
If you want to meet Odin and ask him for a favour you can go after sundown on yule eve to the last of three gates that all open in the same direction and wait for him to come riding out to hunt. You can also meet him at crossroads, on gravemounds, or under giant oaks. In these cases you go to the place after the proper preparations on a Thursday after sundown, dedicate yourself to him, and call out, "Ode come, Ode come, Ode come! Give me [what you seek and he can give]. I will put you into service!" [2] In return for what you ask of him he will want a three course meal - and beer to drink to that - every ninth Thursday night, so his services aren't all that expensive (although I have heard some say a three course meal every ninth week is the least he will want). Of course, you will have to be an excellent cook.
[1] Not to be confused with the neo-pagan Yule. In Scandinavia we never changed name on our midwinter celebrations after the Christianisation processes [link]. Possibly because the name was connected to a whole month of ritual feasting and holy days, and therefore was difficult to transfer to the one mass the Christians reserved to celebrate the birth of Christ - the Christ mass. We still call this period yule - or jul/jol as we spell it - and many of us have never really seen it as a particular Christian holiday.
[2] Yeh, I am sure many of you now are reminded of several other powers that are worshiped or called on in similar ways on/by graves, at crossroads, and under trees. Odin is in later tradition often confused with these other powers, and they share many bynames and characteristics with him - or he with them. Some people even insist they're actually all the same power, only in different disguises, but I think that's a bit like saying that all of you who read this really are the same individual, you just look and behave different depending on which name I call you by or in which culture I am finding myself.
A somewhat different version of this blog has been published earlier as part of a blog project I participated in some years ago.