Randomness
The name Gastrell - despite its rarity - has the unique feature of being banned in Stratford-upon-Avon. This is owing to the dramatic action of Rev. Francis Gastrell, who resided in New Place (once William Shakespeare’s home) during the 18th Century. Irritated by the large numbers of passers-by staring at the Bard of Avon’s former residence (particularly a mulberry tree supposedly planted by the poet, which enticed people to trespass and steal cuttings from it), Gastrell cut down the tree and chopped it to pieces. An alternative story suggests that Gastrell believed this action would lessen the value of the property (and the amount of tax he would have to pay).
In an apparent bid to avoid taxes, Gastrell went so far as to have New Place pulled to the ground entirely in 1759. This unforgivable action resulted in Gastrell being forced to leave the town, never to return. To ensure that neither the Reverend (nor his descendents) ever entered Stratford again, a bylaw was passed prohibiting anyone with the name Gastrell from taking residence in the area.
Source: http://blog.myheritage.com/2011/04/rare-british-surnames/
No reason. Just something I found on the internet.