Judging by the taciturnity, nobody found these at Atomica :-)

'Egsosts' looks like a random conglomeration of letters. Some Carmarthenshire site has it. I thought you were our authority on Cymraeg, Mav?

'Batris' is a little more common, being a name (Greek?) and some StarTrek ship. The route of battery is also batri (ME), for what it's worth.

'Siocs' is some abbrev.

'Teiars', see Egsosts above