Iwasaki and Henkotsu seem to be popular on here
for a look at them + other makers, see TAMAHAGANE MARU SEI | Tamahagane Honsha – Japanese Straight Razors and Knives [no affiliation, yada, yada]
the original Iwasaki was rightly legendary, he was a metallurgist who also worked on classifying Japanese Natural stones,
as well as having a hand in developing new steels in Japan
tho he did use tamahagane also
as do other Japanese razormakers ..