O.E. þancian “to give thanks,” 

(cf. O.S. thancon
O.N. þakka
Dan. takke
O.Fris. thankia
Ger. danken 
“to thank”), 

from *thankoz “thought, gratitude,”
from PIE base *tong- “to think, feel.” 

For sense evolution, 

cf. related O.E. noun þanc, þonc

originally “thought,” 

but by c.1000 “good thoughts, gratitude.” 

The whole group is from the same root as think

info. source here

2 Comments Add yours

  1. Brian Miller says:

    ok i find this fascinating…i dont have any clue what it means…but it is fascinating…

  2. Maureen says:

    Word derviations are so fascinating.

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