Kommentar zu Divrej Hajamim I 1:11

And Mitzraim begot Ludim In Genesis Rabbah (37:5) “Said Rabbi Abba bar Kahana: The entire coinage of Mizraim is only in the sea. Said Rabbi Joshua ben Korhah: ‘Ludim’ is written ‘Ludiim’ in chronicles, with two ‘yuds,’ to tell you that ‘Ludiim’ means לוּדֵי יָם, Ludim of the sea; Anamim, Anamim of the sea; Lehabim, Lehabim of the sea; Naphtuhim, Naphtuhim of the sea.”