niittykellukka (Finnish) comes from Finnish kellukka, from Finnish kello, from Proto-Finnic kello, from Proto-Germanic skellǭ, from Proto-Indo-European sḱel-, from Proto-Indo-European ḱelh₁- — to warm up, to be hot; to warm up, be hot.
Ancestry of “niittykellukka”, step by step
niittykellukka traces back through two separate lines of ancestry.