Brisket – I think there are plenty of Schneur Zalman ben Shlomos and Shlomo ben Schneur Zalmans out there.
Tzvi Hirsch, Arye Leib, Zeev Volf etc came from a time when only Yiddish was spoken and when loshon hakodesh names were meant only for shul etc.
Shaya and Shea are nicknames, although there is one Shaya I know of whose official name is not Yeshaya(hu). His name is spelled shin-yud-yud-aleph and it is roshei tyvois Shygetz Aross!