If Finnish names were used to indicate a family's original trade (as with English and German names, like Miller, Shoemaker, Brewer, Smith, etc.) then the term "foot" or "Jalka" could refer to a profession such as a cobbler or tracker.
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Karl James Jalkanen, PhD (Chassell, Michigan, 1958-) is a researcher in Molecular Biophysics at the Technical University of Denmark in the Department of Micro- and Nanotechnology.