The human gait is a biometric feature that is unique to any individual. Since the human body affects the propagation of wireless signals, wireless networks can be used for identification of persons walking nearby. This biometric identification approach has been object of research in several studies described in the literature. In this contribution, we present a gait-based wireless user identification system that outperforms these existing solutions in terms of cost, effort and accuracy. Firstly, using a mesh network of low-cost wireless sensor nodes, the identification error rate could be reduced by more than 80 % in comparison to the best of prior studies. For a set of six persons to be identified, the identification accuracy could thus be improved to more than 99 %. Secondly, using the technique of Transfer Learning, the capabilities of the proposed system can be easily transferred to unknown persons and locations with only a few minutes of training effort. Training the system on the identification of six unknown persons, it has been found that the training effort can be reduced by about 96 % without a significant loss of accuracy.