🚀 go-pugleaf

I have an inkling I've seen this question posed before but can't remember the
answer.
How do you treat non-standard (foreign) initials like Russian Yu. or Ya, or Kh.
and particles like French du and de as part of a name.
For instance, Yu. Gagarin will appear in the Ref. list as Y. Gagarin, but
Yu. is a special letter that should be shown as Yu.
In the case of French particles, is there a way to keep it after the
initial instead of before the last name, i.e. Gaulle, C. de, not: de Gaulle, C.
?
Is there a simple solution?

Harald