Google's underlying database is called Knowledge Graph, and some people call it that
. Microsoft Bing's similar knowledge base is called Satori Knowledge Base. Looks like Google calls the sidebar a Knowledge Panel
I would've called it search summary, but some people seem to use that to refer to the snippets under the title/link for a result.
"Knowledge panel" seems to be reasonably generic, unambiguous, and definitely understandable with some minimal explanation. A few quick googles show that both "knowledge panel" and "knowledge graph" are being genericized
, and you can find people using both when discussing Bing, though Microsoft probably don't use either term.
Also of note, while a lot of info in Google's knowledge panel comes from Wikipedia, but not all of it, so "Wikipedia sidebar" would not be quite accurate.
Hope that helps,