Reconstruction:Proto-Finnic/-icci

Etymology
Aikio and Ylikoski (2016) proposes that the prolative ending, which they reconstruct as (the form attested in Finnish), is in fact a contraction of a Finno-Samic postposition  (with a cognate in 🇨🇬, and from the same stem as  with a lative ending), through the development *-n śüδik (*-n is the genitive ending) > *-ńśüik > *-ńćik (> (Late) Proto-Finnic *-iccek). Alternatively possibly from the oblique stem *-icce- of.

Suffix

 * 1) by way of, via