There are many circumstances which make linking researchers with their research by name a challenge:
Unique author identifiers are the solution:
See this article from Nature: Research Profiles: A Tag of One's Own. "Digital identifiers can sort out different scientists with the same names, and create a lifelong record of their work."
The "Add Works" menu in gives various options for adding publications to your ORCID profile, including: adding publications manually; adding publications by using a DOI, PMID or other identifier; and by importing publications from other systems. We recommend as a first step to use the Scopus wizard to import your publications. Scopus is the largest indexing and abstracting database of peer-reviewed scientific literature and will more than likely have indexed publications that belong to you.
Scopus to ORCID step-by-step