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Hi Usha,

Heidrich is a form of the German first name Heidenreich (nowadays merely used as a surname as far as I know) which comes from Old High German "heidan" (heathen) and "rihhi" (rich, wealthy).

Kaplan is
1) a German surname which comes from Middle High German "kappellan" (chaplain)
2) a Turkish surname which means 'tiger'.

Music could be (just a wild guess!!!) related to the Polish word "musiec" (with a ´ on the c) which means 'to have, must'

Plank/Planck is a German surname which comes from either
1) Middle High German "planke" (plank fence)
or
2) Middle High German "blanc" (white, shining, beautiful)

Regards, Satu