there are currently, at least six artists using this name from USA, Mexico, Germany, Thailand, UK & Belgium. Other artists have used this name in the past.
Artists who are known to use the name are Len Klass , Sheila Gripe, Beatrix Jekyll.
There was also a Lincolnshire rock band from the 70's called Filthy Turd and a number of DJs have used the name as a temporary moniker. Most famously, the actor Vincent Gallo.
The Swiss noise/performance group 'Ultimate Girl-Gang' often scrawled 'Filthy Turd' on the cover of their releases to create confusion amongst people looking looking to purchase 'actual' Filthy Turd recordings. According to their singer, Yellow Debby, they did this purely for laughs.