What is sir in Welsh?

There isn't a direct equivalent of "sir" in Welsh, as it's not a common title of respect used in the same way in Welsh culture.

However, depending on the context, you could use:

* "Syr" - This is a more formal and archaic term, similar to "Sir" in English. It's rarely used in everyday speech.

* "Mr." - This is the standard abbreviation for "Mister" in Welsh, used before a man's surname.

* "Arglwydd" - This translates to "Lord" and can be used as a formal title of respect, but it's usually reserved for someone of high social standing or religious authority.

* "Ysgolhaig" - This translates to "Scholar" and can be used as a title of respect for someone with extensive knowledge or expertise in a particular field.

The best way to address someone respectfully in Welsh is to use their full name or title, followed by "Mr" or "Ms". For example, you would say "Mr. Jones" or "Ms. Evans".

It's always best to be aware of the context and the person's social standing before using any title of respect.