Oh, what? Is "eci" (eternal?) the origin of "Ecki Thump" - Yorkshire version of OMG?

Public Domain audio:

https://librivox.org/caedmons-hymn/

The text is read in the Early West Saxon dialect. Same version found here (incl. OGG Vorbis format):

https://gutenberg.org/ebooks/19677

  Nu scilun herga hefenricæs uard
  metudæs mehti and his modgithanc
  uerc uuldurfadur sue he uundra gihuæs
  eci dryctin or astelidæ.
  he ærist scop ældu barnum
  hefen to hrofæ halig sceppend
  tha middingard moncynnæs uard
  eci dryctin æfter tiadæ
  firum foldu frea allmehtig

"Caedmon's Hymn"