In the U.S. in 2015, it ranked 5,063 in baby name popularity for girls with 27 occurrences. Less than 5 boys were given the name. In contrast, the year before it ranked 6,620 in baby name popularity for girls with 19 occurrences. Less than 5 boys were given the name. View the Raisa Name Popularity Page to see how the popularity trend for Raisa has changed since 1880, or to compare the popularity of Raisa to other names.
If someone has the feeling of tightness in the hamstrings there can be a variety of reasons for this. Probably the most common is there is something wrong in the back or pelvis (even if they feel no symptoms here). Also there could be some local problem in the hamstrings themselves such as a tear or scar tissue.
The recurrent, painful tightening usually occurs in the calf muscles and can cause severe insomnia. The exact mechanism is unknown, but the cramps are probably caused by muscle fatigue and nerve dysfunction rather than electrolyte or other abnormalities.