On secondary profiles, explicitly state your primary name. Use a consistent phrase such as: "Kristina Melba (also known online as Kristi)" . This links the entities together in the eyes of search algorithms.
The exact phrase represents a highly specific, fragmented search string often associated with niche online databases, digital modeling portfolios, or automated archival indexing. DD-s Kristina Melba -aka Kristina Melba- Kristi...
The "DD-s" prefix you mentioned is often associated with specialized designations in professional fields or specific digital identifiers, but without further context, it is difficult to construct a factual biographical article. On secondary profiles, explicitly state your primary name