Japanese names are very tricky. There are so many ways to correctly read names them as we all know.
Ultimately, I've found it best to confirm with the client.

督造 is also read as the male name “Yoshizo/Yoshizou” from the rules for reading Japanese names.
The below website shows how 督 can be read as “Yoshi” in the front of “given names” for men or women, or at the back of male names.

http://www.geocities.co.jp/SilkRoad-Forest/6130/kanji/jinmei...
よし（人名接頭・男性名接尾）
義・良・慶・芳・佳・由・吉・祥・好・嘉・淑・栄・宜・是・克・恵・美・快・允・叔・能・誉・賀・善・喜・圭・禄・悦・禎・可・斎・儀・欣・至・祉・誉・幹・孔・昌・譲・兆・督など

The names that began with 督 in my “Japanese Names” directory by P.G. O’Neill showed these 3 names only:
督正 = Tadamasa
督応 = Yoshio
督章 = Tadaaki

Also, these were the only “spellings” in the same book when I looked under “Tokuzo” and “Yoshizo”:
Tokuzo = 得三、徳三、徳蔵
Yoshizo =　由蔵、芳蔵、義三

It's always a challenge.