Webster's 1828 Dictionary
SIRRAH
n.A word of reproach and contempt; used in addressing vile characters. Go sirrah, to my call. [I know not whence we have this word. The common derivation of it from sir, ha, is ridiculous. ]
Webster's 1913 Dictionary
SIRRAH
Sir "rah, n. Etym: [Probably from Icel. sira, fr. F. sire. See Sir. ]
Defn: A term of address implying inferiority and used in anger, contempt, reproach, or disrespectful familiarity, addressed to a man or boy, but sometimes to a woman. In sililoquies often preceded by ah. Not used in the plural. "Ah, sirrah mistress. " Beau & Fl. Go, sirrah, to my cell. Shak.
New American Oxford Dictionary
sirrah
sir rah |ˈsirə ˈsɪrə | ▶noun archaic used as a term of address for a man or boy, esp. one younger or of lower status than the speaker. ORIGIN early 16th cent.: probably from sire, when still two syllables in Middle English, with the second syllable assimilated to ah .
Oxford Dictionary
sirrah
sirrah |ˈsɪrə | ▶noun archaic used as a term of address for a man or boy, especially one younger or of lower status than the speaker. ORIGIN early 16th cent.: probably from sire, when still two syllables in Middle English, with the second syllable assimilated to ah .
Duden Dictionary
Sirrah
Sir rah Eigenname , die |S i rrah |arabisch ein Stern
The Wordsmith Dictionary