I wasn't aware of these but there was a class of RN ships called the insect class - they were all gunboats of about 650 tons. Many of these were used for patrolling the Yangtze river until the 1930s. Glowworm is probably one of the least problematic of the names:
APHIS (1915), BEE (1916), both by Aisa Co.
CICALA (1915), COCKCHAFER (1915), CRICKET (1915), GLOWWORM (1916), all by Barclay Curle.
GNAT (1915), LADYBIRD (1915), both by Lobnitz.
MANTIS (1915), MOTH (1915) both by Sunderland S.B. Co.
SCARAB (1915), TARANTULA (1915), both by Wood, Skinner and Co.
Thanks to -
http://hmsfalcon.com/
The RN has long tradition of reusing ship names - since the Glowworm gunboat was scrapped in 1928 what better name for a G class destroyer -
better than "Gnat" anyway.
Regards,
Charlie