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ungaltuia peyar enna?

I would like to help you, but I do not know.

ungal peyar enna? 

உங்கள் பெயர் என்ன?

hai

unga pearu enna? is correct spoken form.

"peyar" is written form.

pearu actually means person, but in this context it means name.

If you wanted to be more polite you can ask "unga pearu ennanga?" less polite form would be "un pearu enna" - least polite form (intimate) for male is un pearu ennada and female is un pearu ennadi.

Finally words like "amma" "appa" can be appended to "enna" like ennamma and ennappa as a term of respectful endearment to other women and men.

ungal ummawin mahanda peyer enna?

"un perenna?" this should be asked to the person who is younger than you..

"unga perenna?" this is for the person who is elder to u.....

it is ungal peyar yenna

Ungal Paeyar Enna? It's more formal

To younger-Un paeru enna?-Informal

To Older-Unga Paeru enna?-Informal

What-Enna?, Paeyar-Name, Ungal-Yours, Un-You, Unga-You...