How do I sign my papers? My name is Jorge Fernández de Cossío Díaz. In my country, we have two last names: the first (Fernández de Cossío) comes from the father side, and the second (Díaz) comes from the mother side.

I have been suggested various signatures:


"J. Fernandez-de-Cossio Diaz", without the accents, since I've been
told that this helps search engines locate my paper. The hyphens supposedly help the        search engines to not mistake Fernandez-de-Cossio with two or three last names.
"J. Fernández-de-Cossío Díaz" (with the accents, since that's how my
is actually name spelled)
"J. Fernández de Cossío Díaz"
"Jorge Fernández de Cossío Díaz"


You can suggest new ones. I want to make sure that the search engines and citation indexes, etc, do not get confused. Also, if in my CV I write my name as "Jorge Fernández de Cossío Díaz", will it be ok if the papers are signed as "J. Fernandez-de-Cossio Diaz"?
In principle, you can use any professional name you like to sign your papers.  I have a few colleagues whose nom de plume (or perhaps nom de LaTeX?) is not the same as their legal name.

But by default, I would recommend signing your papers precisely as you sign anything else, including spaces and accents:


  Jorge Fernández de Cossío Díaz


It would be helpful for people citing your papers to state, somewhere in your CV and on your professional web page, that your last name contains three spaces.  And you'll have to correct copy-editors who incessantly abbreviate it as "J. F. C. Díaz", but you'd have to do that with the other suggested variants anyway.   Modern search engines have no trouble with accents.