How to avoid evil-minded form replies

I have got a from where people can apply for membership in a club. Everyday I receive applications from sort of evil-minded people like
first name: WcrLMrJnxLwOl
family name: pJFxPjSDRprMN
address: TJnxLowhiGDdwZiywPr
The responses don't make sense, not even in my native language.
Is there a way to filter so only seemingly sensible replies go through? Sensible values are western European names.
I have tried jQuery validator:
jQuery.validator.addMethod("lettersonly", function(value, element)
	return this.optional(element) || /^[A-ZÅÖÄa-zåäö-]+$/i.test(value);
"Endast bokstäver");
$().ready(function() {
	// validate signup form on keyup and submit
		rules: {
			fornamn: {required:true,lettersonly:true},
			efternamn: {required:true,lettersonly:true},
			adress: "required",
			postnr: {required:true,number:true},
			ort: {required:true,lettersonly:true},
			telnr: {required:true,number:true},
			mailadress: {required: true,email: true},
			stadgar: "required"
		messages: {
			postnr: "&nbsp;&nbsp;<span style=\"color:#800000;\">Ange siffror utan mellanslag</span>",
			telnr: "&nbsp;&nbsp;<span style=\"color:#800000;\">Ange siffror utan mellanslag</span>",
			mailadress: "&nbsp;&nbsp;<span style=\"color:#800000;\">Glöm inte ange din e-postadress!</span>",
			stadgar: "&nbsp;&nbsp;<span style=\"color:#800000;\">Läs stadgarna och godkänn dem</span>&nbsp;"

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but the configuration I use doesn't stop people from sending me garbage.
Please help!
Lennart EricsonAmateurAsked:
Who is Participating?
Dan CraciunConnect With a Mentor IT ConsultantCommented:
Those look like automated attempts. Do you use Captcha or similar to verify the people applying are actual people?
Lennart EricsonAmateurAuthor Commented:
Thanks for your reply.
No I am not using Captcha. I will.
I'll accept this answer and try captcha. If the garbage is of other oriigin, I'll return.
For now, thanks!
Dan CraciunIT ConsultantCommented:
Glad I could help!

FWIW, I am familiar with those types of random submits and have been able to get rid of them using Captcha. A human won't bother typing in small and caps char.
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Lennart EricsonAmateurAuthor Commented:
Trust you!

Am working on it.
Lennart EricsonAmateurAuthor Commented:
Lennart EricsonAmateurAuthor Commented:
Thanks, padas!
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