Well, I've been doing some brief research into the history of the Krueger surname. It is sometimes pronounce Kree ger or Kra ger.
Various spellings Kruger, Kreuger, Kriiger, Crager.

Well it seems that the name Krueger appears in several variations in the UK records.

Scotland: Kirquhar (Prounounced Kir ger) (Argyle and Caithness)

Looking at the Clans... I found that another varriation of the spelling,
Kerracher (Prounounced Ker ker) under the sept of Farquharson.

Interesting.