A harbor seal whisker is generally elliptic, having a wavy surface along the whisker axis. Compared to a straight cylinder, a wavy elliptic cylinder can modify the vortex shedding, making the flow incoherent, and elongate the vortex formation length, reducing the fluid force. This numerical study explores how the spanwise wavelength (λ) of a sinusoidal wavy cylinder with an elliptic cross-section affects wake structures and fluid forces at a Reynolds number of 100. The investigation covers a wide range of wavelengths (0.43 ≤ λ/Dm ≤ 8.59), with a wave amplitude of a/Dm = 0.048, where Dm represents the hydraulic diameter of the wavy cylinder. The results reveal five distinct flow patterns (I − V), depending on λ/Dm. Notably, flow pattern IV exhibits a unique behavior compared to traditional flows: instead of synchronous vortex shedding along the entire cylinder, vortex shedding occurs alternately over one half of the wavelength, out of phase with the other half, resulting in zero net fluctuating lift over one complete wavelength.