dukeliThe Walsh spectrum of dukeli is (8, 4, 2, 2, 2, -2, 0, 0, 4, 0, -2, -2, 2, -2, 0, 0).

 Image set Walsh spectra of 4-ary Boolean functions; families

The matrix on the left is the family matrix of Boolean function in its top row.
The number rows on the right are the corresponding Walsh spectra. They differ only in their signs.
The distribution of signs corresponds to the pattern of a Walsh matrix, which is highlighted in blue.
The red background in the matrix on the right represents 1s in the binary Walsh spectrum, shared by these functions.
Own work
WatchduckYou can name the author as "T. Piesk", "Tilman Piesk" or "Watchduck".