Martina is the Latin feminine of Martin — from Mars, the Roman god of war. Martina Navratilova (born 1956) — Czech-born American tennis champion — holds the record for most Wimbledon singles titles (9) and most Grand Slam titles overall (59 across singles, doubles, and mixed doubles). Defected from Czechoslovakia to the United States in 1975 at age 18; came out as gay in 1981, making her one of the first prominent openly LGBTQ athletes. Won 18 Grand Slam singles titles including a record-setting 6 consecutive Wimbledons. Martina Hingis (born 1980) — Swiss tennis prodigy who won her first Grand Slam at 16.
Subject of Sandra Faulkner's Love Match: Nelson and Winnie Mandela / Martina Navratilova and Judy Nelson (1991).
In Pythagorean numerology the letters of Martina reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.