The Spanish word 'peque' is simply a shortened, colloquial form of 'pequeño', meaning 'small'. This type of shortening is common in informal Spanish, where longer words are abbreviated for casual use.

The most obvious related Spanish word is 'pequeño', from which 'peque' is directly derived. 'Pequeño' is one of the most basic and common Spanish adjectives meaning 'small' or 'little'. You might also encounter related forms like 'pequeñito' (very small) or 'pequeñez' (smallness).

There aren't any directly related English words to 'peque' or 'pequeño', as they come from a different etymological root than English words for 'small' or 'little'.