thanks for your suggestions, but I think the name is quiet common, and has nothing to do with Soetoro, which as I have shown in a previous comment on this thread, is itself an abreviated version of the full names of Lolo.
There’s a family website:
http://banihasan.blogspot.com/2011_05_29_archive.html
...which shows numerous Soebarkah. You will see BANI SOEBARKAH - I can’t say for certain, I don’t understand the language, but the best I have been able to come up with, is that BANI means ‘the children of’
So welcome to the ‘children of SOEBARKAH’ it’s a very large family.