Jacob Grimm in his Teutonic Mythology volume 1 refers to a German Goddess called Zisa. He found references to this Goddess going back to the 11th century CE. He also refers to a rhyme composed in about 1373 AD by a cleric, Kuechlin about the history of Augsburg which was dedicated to the Burgomeister, Peter Egen the Young. I reproduce the relevant excerpt as follows:-
"Sie bawten einen tempel gross darein zu eren[in honour of] Zise der abgoettin, die sie nach heidnischen sitten[after heathen ways] anbetten zu denselben zeiten[adored in those days]. Die stat ward genennt[city got named] auch Zisaris nach der abgoettin[after the goddess], das was der pris. Der tempel als lang stund unversert[stood uninjured], bis im von alter abgieng[as from age it passed away], der berg namen von im empfieng[the hill took name], daruf gestanden was[whereon had stood] das werck, und haist noch huet[hight still to-day] der Zisenberck."Grimm says that the older spelling of Her name is Cisa and "that she was most devoutly worshipped by the Suevi" and Her great feast day which consisted of games and merrymaking was held on 28th September. Grimm speculates that Zisa/Cisa is the same divinity as Isis who is referred to in Tacitus` Germania 9.1:
"Part of the Suebi sacrifice also to Isis; I have not ascertained the source from which the foreign rite originates, but the fact remains that the image itself, fashioned in the form of a light ship, proves that the cult is imported."
According to Nigel Pennick Cisa/Zisa had a shrine at Augsburg in Germany and her annual festival took place on the 28th of September. (The Complete Illustrated Guide to the Runes), the original name of this city being Zisenburg (A History of Pagan Europe, Pennick/Jones) or Zizarim (The Book of Primal Signs, Pennick). The Roman name of the city was Augusta Vindelicorum. The symbol of Zisa is the pinecone and many large stone pinecones survive from Roman times. Mr Pennick states that the Stadtpyr is the emblem of Augsburg and Her cone appears as a weather vane on the church of St. Peter-am-Perlach, which was built on the site of a holy hill dedicated to the Goddess.
Tyr was a generic name for 'God' and appears as a suffix in many Germanic names of deities or as bynames of Woden such as Hangatyr (God of the hanged), Hrafntyr (God of ravens), Valtyr (God of the slain). The reason that this became a generic term is because He was the original Sky Father before being supplanted by the later Woden as the Germanic peoples by necessity became more warlike due to pressures from the Slavs, Romans and the need for ever more Lebensraum. Tyr became just another war God along with Thunor and Woden, His original pre-eminence all but forgotten.
Tyr was the original Das Gott of the continental Germans, Teut, the eponymous ancestor of the Teutons, the God of Teut Land >Teutschland > Deutschland. My readers will notice that I have used the German neutar as a definite article because originally God was neither male nor female. My article http://armanen.blogspot.co.uk/2013/06/das-gott-of-ancient-teutons.html discusses this in more detail. Tyr/Tiw/Zio and Cisa/Zisa were male and female emanations of the original sexless Das Gott, the shining God of the Aryans. He/She may be traced back to the Proto-Germanic *Tiwaz and in turn to the Proto-Indo-European *Deiwos. This deity was the shining celestial God of the heavens, represented by the Tyr/Tiw rune.