The Spanish verb 'mangar' meaning 'to steal' or 'to grab' comes from Caló, the language of Spanish Romani people. In Caló, 'mangar' meant 'to beg' or 'to steal'. This word entered Spanish slang through contact with the Romani community in Spain and has retained its connection to taking or acquiring things, though often in an illicit way.

While 'mangar' is itself a relatively informal or slang term in Spanish, it doesn't have many common etymologically related words in Spanish since it comes from Caló rather than Latin roots. However, Spanish speakers might recognize it in compound forms like 'mangante' (meaning 'thief' or 'swindler').

There aren't any common English words directly related to 'mangar' since it comes from Caló (Spanish Romani) rather than shared Indo-European roots. However, English speakers might find it helpful to remember that like the informal English phrase 'to grab' (as in 'to steal'), 'mangar' combines the ideas of taking or grabbing with theft.