@kiuku,
That's the thing, there are so many sources, and I have used every single one.
Proof A:
Sound 'KA' means Light
Cave, the (The start of human logic, the beginning of Man):
cave is 'ca' and 'ov', or 'of', or 'ob', all which mean to darken (as in word obtuse or obfuscate); cave has always been about light, cave means without light, a place without light (see Plato's logic)
cover, coven, cove
also:
Luci-light, ci-like 'see' light, luc eluc, elude, to bring, to bring light luci therefore 'ci' means light, as in 'see'
Christ, CA is the first sound in Christ, which means light
Then:
when a magician performs he is commanding light, first of all, and 'ca', sound 'ca' means to quickly bring something about magically, like poof, big.
It is in ancient vocal command Abracadabra, where Abra repeats by CADA.
KADA, is Russian too, from gypsies obviously, and means to quickly bring something about like light, phrase ka da ka da, means to achieve something quickly with great ease. Meanwhile cada means to repeat a phrase, as in cadence, cadence upon cadence, means decadence, and decade, to do over.
And no kidding, abracadabra is egyptian from their basics, probably ka ra and ba. Have a nice day.