tears, weep, cry
淚 centers on the physical and emotional act of shedding tears: weeping or crying.
淚 combines 氵 (water) with 戾, which likely contributes the sound and the idea of something flowing or twisting, suggesting water flowing from the eyes.
The left side is water 氵, and the right side 戾 looks like a person with a twisted expression. Picture water streaming down a face twisted in weeping: 淚 is tears.
For ルイ, imagine a weeping person named Louie: Louie -> ルイ, and his tears flow like the water radical on the left.