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Italian word su comes from Latin sub, Latin vertere, and later Latin sursum (Above. Upwards.)
sub (Latin)
(with ablative) about, around (time). (with ablative) at the feet of. (with ablative) behind. (with ablative) under, beneath. (with ablative) within, during. (with accusative) under, up to, up under, close to (of a motion). (with accusative) until, before, up to, about.
vertere (Latin)
subversum (Latin)
sursum (Latin)
Above. Upwards.
sūsum (Late Latin)
suso (Italian)
su (Italian)
About, on. Above. In, out of. On, upon, onto, on top. Over Up, upstairs Come on!.