I found the suffix -ides tagged as "3rd. decl." on Wiktionary, with "-idis" as its genitive. But as I learnt, the patronymic suffix -ides is a Greek-type 1st. decl. suffix (e.g. L&S: "Achillides, -ae"), is this Wiktionary entry just a mistake?
Edit: The suffix as in Achillides has a long i, while the suffix on Wiktionary has a short one.
