Definition of "dedication" from Wikidata:
expression of friendly connection or thanks by the author towards another person
Nothing in this definition says that "dedicating to" necessarily implies "naming after". Two examples:
- The novella "Strange Case of Dr Jekyll and Mr Hyde " is dedicated to Katharine de Mattos, but isn't named after her.
- The weapon "Molotov cocktail" is named after Vyacheslav Molotov but isn't a dedication to him, as it wasn't meant to honor him, but to mock him.
Now, if you fear you might not follow the correct use of these tags on wikidata, why not discussing directly the issue with the wikidata community? You'll probably get more useful feedback, as this website has currently very few active users, who don't necessarily participate in wikidata.