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Latin word silla comes from Proto-Indo-European *ser-, and later Proto-Germanic *sulī (Balk; bar; threshold; sill.)
*ser- (Proto-Indo-European)
to flow, run, watch over, protect, to bind, put together, to flow, stream, flow, stream, to watch over, protect, to put in line, in sequence, to tie, to assemble, to arrange, tack, tie, unite
*sēl- (Proto-Indo-European)
to calm, quiet, be favourable
*sulī (Proto-Germanic)
Balk; bar; threshold; sill.
syll (Old English)
silla (Latin)