This signature is on a print from the 1960s. There are symbols in the art such as a fish (see ring and vest clasp)and a hamsa (possibly) in the outer border.
It looks like Hebrew alphabet, רִיקִי "Riki" (or "Ricky"). Note the position of the signature on the canvas – in the bottom left corner, in Hebrew it's "the end of the text" position since they write right to left. The European painters usually sign in the bottom right corner, in the European "end of the text" position, because Europeans write left to right. When the painting is finished, as the last stroke the painters put their signatures, thus finishing the work.
Also, a dot beneath a letter is typical for Hebrew, such a dot is called Hiriq and denotes the [i] sound, like in 'sit', 'pin', or 'give.' And yes, that is very likely hamsas in the outer border.
Unfortunately, I have no idea who Riki/Ricky is or who signed paintings like that.