Origin: Latin prefix inter-
Interestingly has 2 different meanings across 1 category:
in an interesting manner
"when he ceases to be just interestingly neurotic and...gets locked up"
in an interesting way
"The detective told the story of how he solved the case, and it was surprisingly moving to hear about all the clues he found along the way."
Interestingly is formed by adding the suffix -ly to the adjective interesting. This straightforward construction follows standard English patterns for creating adverbs from descriptive words.