eddy current係咪有親戚叫edison?

正確！eddy current 咪說係edison喺火星O既老豆攞！

An eddy current (also known as Foucault current) is an electrical phenomenon discovered by French physicist Léon Foucault in 1851. It is caused when a moving (or changing) magnetic field intersects a conductor, or vice-versa.

渦電流（又稱為傅科電流）現象，在1851年被法國物理學家萊昂·傅科所發現。是由於一個移動的磁場與金屬導體相交，或是由移動的金屬導體與磁場垂直交會所產生。簡而言之，就是電磁感應效應所造成。這個動作產生了一個在導體內循環的電流。

since the physicist that discover eddy current is French but Edison is American...so they don't hv any relationship at all.

No.
[Eddy] is used here as an adjective, it means swirl, or vortex (旋渦). It has nothing to do with the person's name [Edison].