When addressing an older person, insert the respectful word po.
Ano po ang pangalan n'yo?
= Ano pong pangalan n'yo?
What's your name? (polite)
This second-person plural form is the most common way of asking the name of someone older than you.
*n'yo is an abbreviation of ninyo.
Ano po ang pangalan nila?
What's your name? (very formal)
This third-person plural form is an extremely polite version.