So what it boils down to is that nothing is proven or conclusive. You don’t know how his name became Soebarkah, all one can assume is that for that name to be removed in August 1968, it must have been on her passport that she obtained in July 1965.
So it would appear he was named BHO2 Soebarkah before he left Hawaii?
Or he left the country with someone else?
Re soebarkah: that sounds like that religion. I grew up with a best friend whose parents were Subud. I didn’t know the name of it at the time but it is subud because her father is proud of it and it is on his website. Their “guru” (that subud)insisted on changing people’s names - legally - sometimes multiple times - to improve their lives. They were ordered to change their names or that of their kids. My friend lived 5 years with one name and it was changed on her then.