Thos

Tho^s is a short form of the forename Thomas. There are two main types of such shortenings: they are convenient for writing, e.g. in lists; or they are essentially spoken pet-names, and thus informal. (See Conventional abbreviations for forenames.)

Short form	Long form	Informal or written	Other short forms	Remarks
Thos	Thomas	written	Tam(my) and Tom(my) are informal

There is a list of similar names at Conventional abbreviations for forenames, as well as the category:short names

Note that any informal form may be spelled in different ways. Notably, any spelling listed that ends in '-ie' may be written with the ending '-y', and vice versa.

Thos, pronounced with the fist consonant like that in 'think' (IPA: /θ/), unlike Thomas, where the '-h-' is silent, is occasionally used as an informal familiar shortening. Now that the written form is almost dead, this usage is decaying. It can be found as the boys' name for the school porter, 'Old Thos', in Thomas Hughes Tom Brown's Schooldays, a novel published in 1857.