It can also be a little misleading to read too much into Regimental names, prior to 1881 Regiments broadly speaking had numbers not names, but the Cardwell Reforms aimed to encourage Regiments to be more 'local'.
To this end numbered Regiments were reduced to a Battalion in a larger 'named' Regiment.
The 40th Regt of Foot (a Devonshire regiment), became the 1st Battalion, South Lancashire Regiment, and I think the 79th Regiment became the 2nd Battalion.
Battalions were rarely posted to the same place, so it is possible that in 1908 the RDF were barracked in the Kent area somewhere - it may even be that the 2nd Bn were originally a Kent Regiment.
Through many subsequent reforms, some within the last couple of years, the original Regiments are long gone, or maybe remembered by naming a Company after them (as happens with the Blues & Royals I believe.)
I wouldnt look for too deep a meaning, I doubt there was one, as mentioned, right place at right time.
Cheers
Pete