Tap here to turn on desktop notifications to get the news sent straight to you. However, nationally the true figure could be far higher because only 18 out of the country's 45 forces responded to the request. More recently, 14 changed their identities in and seven have done the same already this year. It is in New Jersey. Of those offenders, 14 had been convicted of making indecent images of children, 14 are rapists, and 13 people had been convicted of indecent assault. Archant Dozens of rapists, paedophiles and other criminals on the sex offenders register have changed their names, but police will not reveal their new identities. And in June, hospital DJ Matt Richards, 46, was jailed for 33 months for breaching the terms of his release having been previously jailed for sex offences against a year-old girl in He was first convicted, under the name Gregory, in after having sex with a year-old girl and jailed for five years. Study Roughly one in six sex offenders uses techniques pioneered by identity thieves to fly under the radar and avoid registering their addresses and work places, according to a new report. Last May, it was revealed that convicted rapist Mahmoud Al-Khouladi, 42, pictured had changed his name after his release from prison following a 13 year sentence and struck again He had changed his name from Andrew Watt before beginning a year-long campaign to worm his way into an unsuspecting family in order to get closer to their young child. Merseyside Police and Dyfed Powys Police said giving further details of the offenders would put their human rights at risk. As Roderick Robinson he had received a suspended sentence in September for touching two young girls on a yacht but changed his name a month later and left the UK, breaching court orders by not informing police and his probation officers. The study, conducted by Utica College and funded by the U. Tania Bassett from the probation officers' trade union Napo told MailOnline that it is up to the offender to inform authorities if they change their name, or other circumstances such as their address. The new figures show 19 convicted sex offenders changed their name in , 10 in , nine in , 18 in and eight in Other crimes include inciting a child to engage in sexual activity, sexual activity with a child under, sexual assault, incest, and exposure. Under the name Mahmoud Dadia he was jailed in after admitting rape, attempted rape and sexual assault for offences committed in Manchester and Eccles.